STORY: "This is a movement from the left, because these are radical left lunatics," Trump told reporters from the hallway of Manhattan criminal court, where he is currently on trial over charges he concealed hush-money payments to an adult film star.

Trump has pleaded not guilty and called the prosecution politically motivated.

U.S. campuses from New York City to Los Angeles have been roiled by recent demonstrations where pro-Palestinian students have tried to occupy open spaces and college buildings in protest of Israel's military operation in the Gaza Strip.