White House aide Kellyanne Conway on Monday defended President Trump following a tweet a day earlier in which he criticized the mayor of London just hours after a deadly terror attack.

"It wasn't a political attack," Conway said on NBC's "Today" when asked whether Trump owes the London mayor an apology for his tweet.

"The president stands firm with the people of the U.K. He spoke to the prime minister of the entire country, Theresa May, that same night and again yesterday he announced his support for the U.K. people."

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Conway said she isn't going to let Trump be seen as "the perpetrator here."

"I'm not going to allow, on the day-and-a-half after terrorists did it again, whether they're ISIS-inspired or ISIS-directed, they're savage murderers, it's an evil slaughter as the president said last night," she said.

When pressed on whether Trump owes London's mayor an apology for quoting him in a misleading way, Conway criticized the question.

"So we've got the 23rd ISIS-inspired or directed attack, taking innocent lives, children in Manchester, children in Nice, and we want to know-- put some blame worthiness on President Trump," she said. "I'm just not going to allow it."

Conway said the U.K. is America's greatest ally, adding that the U.S. will do whatever is necessary to help.

Trump on Sunday criticized the mayor of London for his comments following the attack.

"At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'" Trump tweeted Sunday morning.