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Pro-life and pro-choice groups are expected to hold hundreds of demonstrations and counter-demonstrations in cities around the United States today.
Anti-abortion groups have organised protests at more than 200 Planned Parenthood locations calling on Donald Trump to strip the women's health provider of federal funding.
Abortion advocates in turn have organised 150 counter-demonstrations outside politicians' offices and government buildings.
Anti-abortion activists have been emboldened by the new President, who selected their long-time ally Mike Pence as vice president and nominated pro-life conservative jurist Neil Gorsuch to the US Supreme Court.
Last month tens of thousands of anti-abortion activists converged on Washington for the 44th March for Life, where Mr Pence became the most senior government official to speak in person at the annual anti-abortion rally, organisers said.
Earlier in January, speaker Paul Ryan said the House of Representatives would vote to remove funding from Planned Parenthood as Republicans legislate to repeal the Affordable Care Act.
“We have the wind in our sails. The election was a real benchmark. Pro-life voters were really a key constituency and the Trump administration has taken note,” said Eric Scheidler, executive director of Pro-Life Action League, one of the main backers of Saturday's demonstrations.
The group said it had called protests in 46 states, in a variety of large and small cities.
Planned Parenthood, a 100-year-old organisation, provides birth control and other women's health services in addition to abortions at 650 health centres, according to its website.
The Planned Parenthood Action Fund Support said in a statement that abortion rights supporters had also been energised by Mr Trump's election, as exemplified by the hundreds of thousands who flooded Washington a day after his inauguration in defence of women's rights, including abortion rights.
The pro-Planned Parenthood events on Saturday were organised spontaneously by activists without the backing of group, a spokeswoman said.
“All across the country, Planned Parenthood supporters are taking it upon themselves to organise in their communities on their own,” Kelley Robinson, a leader of Planned Parenthood Action Fund Support, said in a statement. “Saturday, and every day, Planned Parenthood advocates and activists show that they refuse to be intimidated and they won't back down.”
Supreme Court strikes down abortion restrictionsShow all 23 1 /23Supreme Court strikes down abortion restrictions Supreme Court strikes down abortion restrictions Abortion rights activists hold placards outside of the US Supreme Court ahead of an expected ruling on abortion clinic restrictions on June 27, 2016 in Washington, DC.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions An abortion rights activist holds placards outside of the US Supreme Court before the Court struck down a Texas law placing restrictions on abortion clinics on June 27, 2016 in Washington, DC. The US Supreme Court on Monday struck down a Texas law placing a raft of restrictions on abortion clinics, handing a major victory to the "pro-choice" camp in the country's most important ruling on the divisive issue in a generation.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions WASHINGTON, DC - JUNE 27: Pro-life activists pray on the steps of the United States Supreme Court on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions WASHINGTON, DC - JUNE 27: Texas abortion provider Amy Hagstrom-Miller looks on as Nancy Northup, President of The Center for Reproductive Rights speaks to the media outside of the U.S. Supreme Court on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions An abortion rights activist holds placards outside of the US Supreme Court before the Court struck down a Texas law placing restrictions on abortion clinics on June 27, 2016 in Washington, DC. The US Supreme Court on Monday struck down a Texas law placing a raft of restrictions on abortion clinics, handing a major victory to the "pro-choice" camp in the country's most important ruling on the divisive issue in a generation.
Getty
Supreme Court strikes down abortion restrictions Texas abortion provider Amy Hagstrom-Miller wipes a tear as she walks down the steps of the United States Supreme Court with Nancy Northup, President of The Center for Reproductive Rights on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions WASHINGTON, DC - JUNE 27: Abortion rights activists Morgan Hopkins of Boston, left, and Alison Turkos of New York City, celebrate on the steps of the United States Supreme Court on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Getty
Supreme Court strikes down abortion restrictions WASHINGTON, DC - JUNE 27: Abortion rights activists Morgan Hopkins of Boston, left, and Alison Turkos of New York City, celebrate on the steps of the United States Supreme Court on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close. (Photo by Pete Marovich/Getty Images)
Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activist Morgan Hopkins of Boston, celebrates on the steps of the United States Supreme Court on June 27, 2016 in Washington, DC. In a 5-3 decision, the U.S. Supreme Court struck down one of the nation's toughest restrictions on abortion, a Texas law that women's groups said would have forced more than three-quarters of the state's clinics to close.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists embrace after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
AFP/Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activists hold placards outside of the US Supreme Court ahead of a ruling on abortion clinic restrictions on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Mandel Ngan/AFP/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
AFP/Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
AFP/Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close. / AFP / MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)
AFP/Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activists embrace after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
AFP/Getty Images
Supreme Court strikes down abortion restrictions Pro-choice activist, Alissa Manzoeillo, of Washington, D.C. waits for rulings in front of the U.S. Supreme Court on June 27, 2016 in Washington, DC. A ruling is expected in Whole Woman's Health v. Hellerstedt, a Texas case the places restrictions on abortion clinics, as well as rulings in the former Virginia Governor's corruption case and a gun rights case.
Pete Marovich/Getty
Supreme Court strikes down abortion restrictions Abortion rights activists cheer after the US Supreme Court struck down a Texas law placing restrictions on abortion clinics, outside of the Supreme Court on June 27, 2016 in Washington, DC. In a case with far-reaching implications for millions of women across the United States, the court ruled 5-3 to strike down measures which activists say have forced more than half of Texas's abortion clinics to close.
Supreme Court strikes down abortion restrictions Abortion rights activists hold placards outside of the US Supreme Court ahead of an expected ruling on abortion clinic restrictions on June 27, 2016 in Washington, DC.
AFP/Getty Images
Supreme Court strikes down abortion restrictions Abortion rights activists hold placards outside of the US Supreme Court ahead of an expected ruling on abortion clinic restrictions on June 27, 2016 in Washington, DC.
AFP/Getty Images
Although US law prohibits the use of federal funds for abortions, anti-abortion activists say funding for other purposes acts to subsidise abortions.
Planned Parenthood receives federal funds from Medicaid reimbursements and Title X, a federal program that supports family planning and preventive health services.
Planned Parenthood says cutting off those funds would make it more difficult for women to get birth control, Pap smears or testing for sexually transmitted diseases.
Additional reporting by Reuters
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