President Donald Trump wants to know who exactly Harvard’s international students are—and why the countries they hail from aren’t paying up. Trump claimed the Ivy League university has not been forthcoming about how much of its student body international students make up in an early-morning screed on Sunday.

Harvard University is challenging the Trump administration’s decision to bar the Ivy League school from enrolling foreign students, calling it unconstitutional retaliation for defying the White House’s political demands.

By Sam Tabahriti, Charlotte Van Campenhout and Anna Dittrich LONDON/AMSTERDAM/HEMHOFEN, Germany (Reuters) -Thousands of foreign students at Harvard University were stuck in administrative limbo and looking for alternatives on Friday after U.