The Mail Online columnist swiftly deleted the tweet, which echoed the Nazi term for the Holocaust, amid widespread condemnation for the “despicable” post.
“Don’t you even dare,” read the tweet directed at Good Morning Britain host Phillip Schofield.
“Do not be part of the problem. We need a final solution. #Machester [sic].”
It was deleted and replaced with a re-worded message reading “we need a true solution", but critics are calling for Ms Hopkins to be fired by Mail Online and LBC radio.
Ms Hopkins has been reported to the Metropolitan Police over the tweet, which was part of a longer anti-Muslim tirade, but the force said it was too early to confirm whether an investigation would be launched.
It came after at least 22 people were killed and 59 injured in a suicide bombing at Manchester Arena on Monday night.
Thousands of people, including many children and teenagers, were leaving an Ariana Grande concert and heading towards Victoria Station when the blast hit the foyer.
It is the worst terror attack in the UK since 56 people were killed in the London bombings on 7 July 2005.
Police are treating the Manchester bombing as a terrorist incident and are investigating whether the bomber was acting alone or as part of a wider network.
No group has yet issued a claim of responsibility for the massacre, which has sparked an outpouring of grief and solidarity from leaders and musicians around the world.
The Prime Minister condemned the “appalling terrorist attack” and was chairing a meeting of the Government's emergency Cobra committee this morning.
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