Conservative activist David Horowitz told Florida talk radio host Joyce Kaufman on Friday that President Obama’s “heart is with the enemy,” which is why he is allowing terrorists to “walk across” the southern border carrying nuclear weapons.

When Kaufman asked Horowitz about the U.S. program to resettle refugees from the Syrian civil war, he warned that the president is “importing our enemies,” adding that Obama and his party have “destroyed our southern border so it’s easy for terrorists to get here.”

“All they have to do is walk across that border,” he said, “and they’re going to do it, and when they come they’re going to bring chemical, biological and eventually nuclear weapons, so don’t kid yourself.”

Kaufman agreed, citing an unfounded Judicial Watch report about an ISIS training camp near the border with Mexico and the president’s recent prayer breakfast remarks to declare that the president has “lost it.”

“He’s a traitor,” Horowitz added. “His heart is with the enemy.”