Hundreds of students, dozens of colleges hit by Trump's visa purge: What to know

Hundreds of foreign students at dozens of colleges across the country have had their higher education experience turned upside down as the Trump administration has expanded its immigration crackdown beyond those involved in the pro-Palestinian protests.  

International students are seeing their visas revoked for infractions as minor as traffic violations, while colleges are having to check immigration databases to find out whether their students are still allowed to be in the country.