An executive order from President Trump promoting a federal crackdown on campus antisemitism and his threats to cancel visas of pro-Palestinian international students have put California university leaders and activists on alert after many of the nation's largest and most contentious protests unfolded at their schools.

President Trump signed an executive order Wednesday seeking to fight antisemitism on college campuses and vowing action against “Hamas sympathizers” among student populations.

President Trump signed an executive order Wednesday that addresses antisemitism on college campuses.The new policy would direct the federal government to cancel student visas for what the White House calls "Hamas sympathizers.