Donald Trump has retweeted three anti-Muslim videos posted by far-right group Britain First.
The group's deputy leader Jayda Fransen, who posted the unverified clips, claims one of them shows a Muslim destroying a statue of the Virgin Mary.
She claims the other two videos show attacks carried out by other Muslims.
The 31-year-old from Penge, southeast London, reacted with delight to the retweets, posting: "God bless you Trump! God bless America!"
After sharing the posts with his 43.6m Twitter followers, Mr Trump fired off three other tweets praising the US stock market, suggesting a boycott of "fake news CNN" and commenting on the sacking of NBC presenter Matt Lauer.
Britain First has attracted a sizeable online following by posting incendiary videos and staging a number of protests.
The group's leader, Paul Golding, was jailed for eight weeks in December 2016 for breaching a court order telling him not to enter a mosque or encourage others to do so.
He and his deputy were due to appear at Folkestone Magistrates' Court on Wednesday for a hearing ahead of a trial scheduled for 29 January over allegations of religiously aggravated abuse in Canterbury and Ramsgate, Kent.
She is also due in court in Northern Ireland in December charged with using threatening and abusive language in connection with a speech she made at an anti-terrorism demonstration in Belfast on 6 August.
Last year, MPs called for Britain First to be proscribed as a terrorist organisation after the murder of MP Jo Cox, who was killed by a right-wing extremist shouting "Britain first".
Ms Cox's widower Brendan said Mr Trump "should be ashamed of himself" for retweeting the Britain First videos.
He tweeted: "Trump has legitimised the far-right in his own country, now he's trying to do it in ours."
Labour leader Jeremy Corbyn called on the Government to respond to the posts.
He said: "I hope our Government will condemn far-right retweets by Donald Trump. They are abhorrent, dangerous and a threat to our society."
MP David Lammy said the US President had "gone beyond the pale", adding that he was "promoting a fascist, racist, extremist hate group whose leaders have been arrested and convicted".
Former shadow business secretary Chuka Umunna described the retweets as "quite shocking".
He told Sky News: "Words do not do justice to this, he is normalising hatred. I think that takes us down a very dangerous road and you have got to call it out."
Meanwhile, TV presenter Piers Morgan, who has called himself a friend of Mr Trump, urged the President to "stop this madness and undo your retweets".
