It was the second time Trump criticized Khan for telling citizens there's "no reason to be alarmed".
On Saturday evening, a vehicle drove into pedestrians on London Bridge and attackers stabbed several people at London's Borough Market. However, the argument that cuts to police funding have contributed to terror attacks is somewhat disingenuous.
Foreign Secretary Boris Johnson, Khan's predecessor as London mayor, also backed Khan but told the BBC he thought Trump should still visit Britain. Photo by Reuters/Clodagh Kilcoyne.
President Trump has drawn harsh criticism for attacking Khan in the aftermath of Saturday's attack.
On Tuesday, May told a political rally in response to a question about Trump's tweets, "I think Donald Trump was wrong in the things that he has said about Sadiq Khan". "MSM is working hard to sell it!"
Sanders also said Twitter is important so Trump can "communicate directly to the people without the bias of the media".
It's not the first time Trump Jr. has bashed Khan.
"The point is, there is a reason to be alarmed".
In an appearance on NBC's "Today Show", Conway said people in England had tried to inform authorities about the suspects before the attacks happened.
Though Clinton did not name Trump particularly, her comments seemed to reference the president's tweets.
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"I think Sadiq is doing an excellent job", she said.
The war of words had began after the London mayor gave an interview on Sunday morning in which he urged people not to be frightened by an increased police presence. No reason to be alarmed.
Labour has accused Theresa May of "letting austerity damage her ability to keep us safe" as it continues its attack over police cuts.
"Trump earlier Monday attacked Khan's response to a terror attack in London on Saturday that killed at least seven people and wounded almost 50".
The U.S. Conference of Mayors, whose membership includes the more that 1,400 U.S. cities with populations of 30,000 or more, said it "stands united" with Khan.
The mayor has been at meetings of the Government's emergency Cobra committee and "we've been working with him to ensure the response was right, and to get London moving again", the Prime Minister added.
"I just haven't got time to respond to tweets from Donald Trump".
"But one of the things about a special relationship is it is like having a best friend".
The two men have history.
Khan said earlier this year Trump should be denied a state visit to Britain due to his "cruel and shameful" immigration policies.