A U.S. government official confirms to CNN that the Department of Homeland Security has issued a memo ordering Customs and Border Protection agents to verify “effective immediately” that every foreign student who wants to enter the U.S. has a valid student visa. …

Of all the problems the U.S. has with immigration, people coming in on student visas, and student visa violations are a very low priority.

“This new directive puts them in a higher priority… so that the government double checks to make sure that their visa is still valid,” said CNN National Security analyst and former DHS official Juliette Kayyem.