Republican presidential candidate Donald Trump called again for tougher U.S. border security following Tuesday’s deadly attacks on the Brussels airport, saying “we have to be very vigilant and careful about who we allow into our country.”

Trump’s comments, in an interview on NBC’s “Today” program, came a day after he expressed skepticism about the U.S. role in the North Atlantic Treaty Organization and said the United States should significantly cut spending on the defense alliance. “As president … I would be very, very tough on the borders, and I would be not allowing certain people to come into this country without absolute perfect documentation,” he told NBC. READ MORE