After several tweets, including one offering USA support to the United Kingdom and another criticizing London Mayor Sadiq Khan, Trump tweeted Sunday morning: "Do you notice we are not having a gun debate right now?"
Mr Trump also repeated calls for his stalled travel ban, took on gun control supporters and pledged that the United States would be there to help London.
Khan's comments came after Trump tweeted about the mayor's reaction to the London attack on Saturday, suggesting the London lawmaker downplayed the terrorist incident.
Most world leaders had confined their messages to solemn expressions of sympathy and support for the victims, the British people and the government of Prime Minister Theresa May.
While she did avoid condemning the president outright, she said that, "Khan is doing a good job and it's wrong to say anything else".
After his election a year ago, Khan tweeted criticism of then-candidate Trump's rhetoric, saying his "ignorant view of Islam could make both our countries less safe".
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"Maybe rather than the mayor of London attacking, maybe he should do something about it", he said.
Mr Johnson added that Mr Khan had a "perfect right and indeed a duty" to speak up for London.
Asked if Trump was criticizing the mayor of London because he is Muslim, Sanders said that was "utterly ridiculous". He promoted a proposed travel ban on visitors from six mostly Muslim countries and refugees from around the world that has been blocked by US courts.
'When you have a special relationship it is no different from when you have got a close mate.
Speaking to Channel 4 News, Khan said Trump was had been wrong about "many things" and the government should cancel his state visit to United Kingdom, expected in October.
Trump accused Khan of making a "pathetic excuse" over his statement urging Londoners not to be alarmed by the presence of additional police on the streets in response to the attack. Conway would not say whether the president should apologize to Khan and, instead, argued that there's an "obsession with covering everything Trump says on Twitter and very little of what he does as president". And not even those misguided folks can approve of Trump's tweets about Khan.
A spokesman for Kahn called Trump "ill-informed". "And I think that's what he's trying to say, because he's been proven right about it every time".