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.

U.S. President Donald Trump will sign an executive order on Wednesday to combat antisemitism and pledge to deport non-citizen college students and other resident aliens who took part in pro-Palestinian protests,