Secretary of State Marco Rubio told reporters at Shannon Airport in Ireland that the detention and possible deportation of former Columbia University anti-Israel protest organizer Mahmoud Khalil is "not about free speech.

A federal judge said Khalil will remain in the U.S. as the court weighs a challenge to his planned deportation, as President Donald Trump says his arrest will be the first of many.

A U.S. green card holder faces deportation after helping lead student protests at Columbia University in New York last spring over the war in Gaza.