Harvard constitutional law professor Laurence Tribe on Monday condemned Donald Trump’s move to strip 7,000 foreign students of their places at the Ivy League school, calling it “obviously unhinged” and legally baseless.

Appearing on MSNBC’s “The Last Word” with Lawrence O’Donnell, Tribe said the president has “no idea what he is talking about” and is simply “slinging around, frankly, B.S.”

“This is a president who hates intellect, who despises the symbol of excellence in the world of higher education around the world,” Tribe added.

In a direct message to the affected students, Tribe urged them not to be intimidated by Trump’s threats.

“Don’t be scared,” he said. “This guy is a paper tiger. He’s a tinhorn tyrant.”