The court's decision is the latest blow to Mr Trump's efforts to shut down travel from several predominantly Muslim countries. The President has attempted to install two travel bans since taking his oath of office, but judges across the country quickly instated nationwide holds on those executive orders.
The 9th Circuit Court, which has jurisdiction over matters in western US districts, is joined by the 4th Circuit Court of Appeals in upholding injunctions opposing Mr Trump's travel ban. The 4th Circuit Court voted to uphold the block last month, saying that while the President has broad powers to regulate who can enter the country, Mr Trump's travel ban was overtly motivated by religious intolerance and discrimination.
Ninth Circuit judges similarly wrote in their decision that US presidents have wide constitutional authority when it comes to securing borders, but that "immigration, even for the president, is not a one-person show."
"We conclude that the President, in issuing the Executive Order, exceeded the scope of the authority delegated to him by Congress," they wrote.
The 9th Circuit's decision is almost surely going to be appealed to the Supreme Court, where the nation's top justices would have the final say on the topic. The particular challenge decided in the 9th Circuit was brought about by Hawaii, which has urged the Supreme Court not to revive the President's travel ban.
Donald Trump's first 100 days: in cartoons
Donald Trump's first 100 days: in cartoons
Donald Trump's first 100 days in office were marred by a string of scandals, many of which caught the eye of the Independent's cartoonists
Trump's first 100 days have seen him aggressively ramp up tensions with his nuclear rivals in North Korea
Mr Trump has warned of a "major, major conflict" with the pariah nation lead by Kim Jong Un
Mr Trump dropped the "mother of all bombs" on alleged ISIS-linked militants in Afghanistan, amid an escalation of US military intervention around the globe
Mr Trump has been accused of falling short of the standards set by his predecessors in the Oval Office, including Franklin D Roosevelt
The tycoon's ascension to the White House came at a time when the balance of power is shifting away from Western nations like those in the G7 group
Western politicians, including the British Conservative party, have been accused of falling in line behind Mr Trump's proposals
Brexit is seen to have weakened Britain, reducing still further any political will to resist American leadership
Mr Trump's leadership has been marked by sudden and unexpected shifts in global policy
Trump's controversial missile strike on Syria, which killed several citizens, was seen by some analysts as an attempt to distract from his policy elsewhere
The President has also spent a large majority of his weekends golfing, rather than attending to matters of state
Though free of gaffes, a visit from Chinese president Xi Jinping spotlighted trade tensions between the two states
One major and unexpected setback came when Mr Trump's Healthcare Bill was struck down by members of his own party
Mr Trump has been a figure of fun in the media, with his approval at record lows
A string of revelations about Mr Trump's financial indiscretions did not mar his surge to the White House
Outgoing President Barack Obama was accused of wiretapping Trump Tower by his successor in America's highest office
The alleged involvement of Russian intelligence operatives in securing Mr Trump the presidency prompted harsh criticism
The explosive resignation of Security Adviser Michael Flynn, who lied about his links to the Russian ambassador, was just one scandal to hit the President
Many scandals, such as the accusation Barack Obama was implicated in phone-hacking, first broke on Mr Trump's Twitter feed
Donald Trump's election provoked mass protests in the UK, with millions signing a petition to ban him from the country
Donald Trump cited a non-existent terror attack in Sweden during a campaign rally
Donald Trump stands accused of stoking regional tensions in Eastern Asia
North Korea has launched a number of failed nuclear tests since Mr Trump took power
Theresa May formally rejected the petition calling for Mr Trump to be banned from the UK
When Mr Trump's initial so-called Muslim ban was struck down by a federal justice, the President mocked the 69-year-old as a "ridiculous", "so-called judge"
A week after his inauguration, Theresa May met with Mr Trump at the White House
Donald Trump's first days in office were marked by a hasty attempt to follow through on many of his campaign promises, including the so-called Muslim ban
Donald Trump's decision to ban citizens of many majority-Muslim countries from the US sparked mass protests
Revelations about Donald Trump's sexual improprieties were not enough to keep him from being elected President
British PM Theresa May was criticised by many in the press for cosying up to the new President
One of Mr Trump's top aides, Kelly Anne Conway, was mocked for describing mistruths as "alternative facts"
British PM Theresa May was quick to demonstrate that her political aims did not hugely differ from Mr Trump's
Donald Trump's inauguration, on 20 January 2017, sparked protests both at home and abroad
Responding to questions regarding the travel ban, White House Press Secretary Sean Spicer said that the administration remains confident that the Supreme Court would ultimately uphold the ban.
"I think we can all attest that these are very dangerous times and we need every available tool at our disposal to prevent terrorists from entering the United States and committing acts of bloodshed and violence," Mr Spicer said. "We continue to be confident that the president's executive order to protect this country is fully lawful and ultimately will be upheld by th Supreme Court".
The court decisions note that the countries targeted by the travel ban don't tend to produce radicalised terrorists who look to harm the US and its interests. Instead, most radicalised terrorists are homegrown, a government memo cited by the courts says.
The Trump administration has repeatedly argued that the courts are undermining the President's ability to keep the country safe, and messaging from the Oval Office has changed over time. While the President, when campaigning in 2016, specifically called for a ban on Muslim travel, the White House has moved away from specifically mentioning religious groups with regard to the travel bans. Still, the courts have taken Mr Trump's past statements on the matter into consideration when determining if the travel bans are motivated by religious factors.
The US government has begun arresting Iraqi immigrants in the US recently after the American and Iraqi governments reached a deal to remove the country from the travel ban list. Those individuals have all been convicted of a crime, according to the government.
The President has remained committed to his travel bans, and has frequently tweeted his support for them when it has become expedient to do so.Reuse content