President Donald Trump faulted former President Joe Biden‘s border policies for permitting a man who allegedly used a flamethrower and Molotov cocktails to set people on fire last weekend during a Jewish community event in Boulder, Colorado, to remain in the country.

“Yesterday’s horrific attack in Boulder, Colorado, WILL NOT BE TOLERATED in the United States of America,” Trump wrote in a social media post on Monday. “He came in through Biden’s ridiculous Open Border Policy, which has hurt our Country so badly. He must go out under ‘TRUMP’ Policy.”