President Obama's former speechwriter warned that President Trump's tweets on Sunday should be seen as a warning, suggesting they could foreshadow the president's behavior during a possible future terror attack in the U.S.

"It's hard to read Trump's tweets this morning and not think that we're one domestic attack away from the most dangerous version of this guy," Jon Favreau tweeted.

It's hard to read Trump's tweets this morning and not think that we're one domestic attack away from the most dangerous version of this guy — Jon Favreau (@jonfavs) June 4, 2017

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Trump tweeted three times Sunday morning in response to the London terror attacks that left at least seven dead and wounded nearly 50.

"We must stop being politically correct and get down to the business of security for our people. If we don't get smart it will only get worse," he first tweeted.

"At least 7 dead and 48 wounded in terror attack and Mayor of London says there is 'no reason to be alarmed!'" he tweeted a few minutes later.