President Donald Trump promised strong leadership and reacted swiftly to the alleged terrorist responsible for Tuesday’s attack that left eight dead and 11 wounded New York City, tweeting “NOT IN THE U.S.A.”

Suspect Sayfullo Saipov immigrated to the United States from Uzbekistan seven years ago under the Diversity Visa Program. In response to this knowledge, Trump said that the U.S. had endured quite “enough” of these terrorist attacks carried out by “sick and deranged” individuals who are not welcome on U.S. shores.

“In NYC, looks like another attack by a very sick and deranged person. Law enforcement is following this closely. NOT IN THE U.S.A.!” Trump tweeted Tuesday. “We must not allow ISIS to return, or enter, our country after defeating them in the Middle East and elsewhere. Enough!”

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The president also pledged to implement more “extreme vetting” measures to keep U.S. citizens safe — even though such talk isn’t “politically correct.”

“I have just ordered Homeland Security to step up our already Extreme Vetting Program. Being politically correct is fine, but not for this!” Trump tweeted.

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