Appeals to Khalil’s free speech rights are meritless. A green card is not synonymous with citizenship, though many seem to believe otherwise. Indeed, the federal government has the power to revoke a green card at any time, consistent with its statutory authority and assuming due process.

One hopes he will be free to express his opinions unfettered in his homeland of Syria or Algeria, where he is a citizen.

The White House says the secretary of state can revoke the visa of Palestinian activist Mahmoud Khalil -- but experts tell ABC News it can't happen without due process.

Whatever legal rationale the Trump Administration cooks up, deporting protesters for things they say is wildly un-American—and possibly unpopular, too.

Lawyers for Mahmoud Khalil say the detained Columbia University student felt he was being kidnapped after his arrest and swift transfer to Louisiana