But the front-bencher urged critics of the president to remember the importance of the trans-Atlantic alliance to Britain.
The Government is facing demands for Mr Trump’s planned state visit to the UK to be cancelled in the wake of his tweet which delivered a direct rebuke to Prime Minister Theresa May.
London Mayor Sadiq Khan said Mrs May should cancel the visit and demand an apology on behalf of the British people from the president, while Liberal Democrat leader Sir Vince Cable branded Mr Trump an “evil racist” whose invitation should be withdrawn.
Answering an urgent question in the House of Commons, Ms Rudd denounced Britain First as “an extremist organisation which seeks to divide communities through their use of hateful narratives which spread lies and stoke tensions.”
She added: “President Donald Trump was wrong to retweet videos posted by the far-right group Britain First.”
More to follow…