The Trump administration is widening efforts to screen visa applicants for online speech considered dangerous and “anti-American” as the government moves to restrict legal migration and remove people from places the president has called “garbage.” The State Department earlier this month expanded new regulations requiring foreign students and people on academic and cultural exchange programs to disclose five years of their social media histories and make all of their posts public. All applicants for H-1B employment visas and their dependents will now also be subject to the more rigorous online review. “A U.S. visa is a privilege, not a right,”...