President Donald Trump’s executive order on foreigners who “support designated foreign terrorists” could be the start of a previously promised crackdown on radical pro-Palestinian students on American college campuses. The Monday directive from Trump orders the U.S. government to deport foreigners who “bear hostile attitudes toward [American] citizens, culture, government, institutions, or founding principles, and do not advocate for, aid, or support designated foreign terrorists and other threats to our national security.” That could describe plenty of foreign students advocating for Hamas and other terrorist groups at American universities, an analyst told the Daily Caller News Foundation. “If a student...