The London attack comes just two weeks after the attack in Manchester that took place after an Ariana Grande concert.
His third tweet managed to be appropriate, offering support for London, but then he began a weird and inaccurate attack on London's mayor: "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!' " It was a ugly thing to say as the mayor desperately tried to keep his constituents from panicking, and all the more disgusting because it took Mayor Sadiq Khan's comments out of context.
Trump appeared to misconstrue the statement on Sunday when he tweeted: "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is "no reason to be alarmed!"
"At a time when anti-Semitic hate crimes are on the rise - when Americans, Muslims, African-Americans, Latinos are being targeted for racism; when violence motivated by hatred from Portland, Oregon, to College Park, ends the lives of young Americans, this program's vision of spreading tolerance is more urgent than ever", Clinton said.
Though Clinton did not name Trump particularly, her comments seemed to reference the president's tweets.
Trump's tweets came after a morning in which he insisted that his travel ban, which attempted to block immigration from six predominantly Muslim countries before it was halted by federal courts, was a necessary measure to prevent attacks like the one that occurred in London.
Yesterday, Labour leader Jeremy Corbyn said Prime Minister Theresa May should stand down for presiding over police cuts during her time as home secretary. "We are not going to let Donald Trump divide our communities", Khan told the BBC.
"The mayor is focused on dealing with Saturday's horrific and cowardly attack and working with the police, the emergency services and the Government to keep London safe". "One of the things the police, all of us need to do is make sure we're as safe as we possibly can be", Khan said. "There are many things about which Donald Trump is wrong".
"We are all shocked and angry today - but this is our city", Khan tweeted on Sunday. "And this president is trying to do something to protect the people of this country".
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. Instead of standing beside the Mayor and making a statement condemning the acts of terror Trump chose to sound the alarm bells by taking Kahn's comment completely out of context.