The circumstances of the case have split the country in predictable ways and led to protests in support of Khalil, including one at Trump Tower that resulted in nearly a hundred a

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.

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.