In another tweet, Trump blasted London Mayor Sadiq Khan for telling Londoners that there "is no reason to be alarmed" after at least seven were killed. Meanwhile, Khan led a vigil of hundreds of Londoners in rememberance of those who died following Saturday night's terror attack in the capital.
"What Donald Trump did in response to the British tragedy was, again, I think, inappropriate for a toddler, much less the president of the United States", Rep. Jim Himes of CT said on CNN's New Day. "There's no reason to be alarmed".
"As a proud and patriotic British Muslim, I say this".
Reporters repeatedly asked Khan for his thoughts on Trump outside the headquarters of London's Ambulance Service, where he observed a minute of silence Tuesday to honor of the victims of the attacks.
When asked if Mr Trump was wrong about his assessment of the mayor, the prime minister said Mr Khan was doing a good job and it was wrong to say anything else.
Trump, however, is clearly not as pressed for time and chose to brand Sadiq Khan's excuse "pathetic".
"The point is, there is a reason to be alarmed". His behavior no longer surprises us, but it should offend and disturb us, first, that he remains the face and voice of America in the world and, second, that his fans hoot and holler, seeing this as inconsequential or acceptable conduct.
"He has risen above this crisis of death and destruction, as mayors continue to do, to alleviate fear, to bring comfort to his people of London", the mayors wrote in a statement on Sunday.
When the British press ridiculed Trump's out-of-context quote, the president returned to Twitter to accuse the media of buying the mayor's "pathetic excuse".
The AP went on to fact check eight more troubling statements made by the president in recent days. Theresa May absolutely must withdraw the state visit.
The attack raised security as a major theme of the general election, set for Thursday 8 June. Self-appointed religious leaders fail to see that this soullessness - not the dreaded liberal elite who insist on saying "Happy Holidays" or refuse to countenance discrimination against gay customers - is a threat to the moral fiber of a democracy that requires a modicum of common sense and human decency to function.
"Try to imagine the United Kingdom prime minister attacking the Mayor of NYC the day after 9/11", said European Parliament cabinet member Simon O'Connor.
On Monday, a spokesman for Khan responded to the latest statement from Trump, saying, "Nothing has changed since yesterday".
After Mr Trump as a presidential candidate announced his plan, Mr Khan told the BBC he hoped he would "lose badly", adding that he was a "buffoon". Trump later challenged Khan to an IQ test during an interview on ITV. We need the courts to give us back our rights.