Donald Trump has described Sadiq Khan as “a disaster” after a weekend of bloodshed in London which saw three men killed in separate attacks in less than 24 hours.
Retweeting a post by Katie Hopkins in which she described London as "stab city" and "Khan's Londonistan", the US President said Mr Khan was a "national disgrace who is destroying the capital", adding that London needs a new mayor "ASAP".
Labour MP Naz Shah criticised the government for failing to respond to Mr Trump’s tweet.
“If Donald Trump can endorse the far-right that use racist tropes to attack the Mayor of London and that does not warrant a response from our Prime Minister or those planning to become Prime Minister, then it sets a dangerous and worrying precedence,” she said.
“Minority communities are directly impacted on when hatred and bigoted views are legitimised.
“Those communities will be looking at who will stand up for them? So far, there is nothing but deafening silence from this Conservative government.”
Fellow Labour MP Dr Rosena Allin-Khan teeted that the US President was a racist bigot who wants to stir up tensions.
Since the weekend, another murder investigation has been launched after the death of a fourth man.
The victim, believed to be aged in his 40s, was found collapsed with stab wounds in Stratford on Monday morning.
Eleven people have been arrested in connection with the violence over the weekend, the Metropolitan Police has said.
Met Police spokesman Matthew Twist said officers will "continue to undertake high-visibility patrols" over the next few days.