U.S. President Donald Trump threatened on Friday to ratchet up his trade war once again, pushing for a 50% tariff on European Union goods starting June 1 and warning Apple he may slap a 25% levy on all iPhones bought by U.

The Trump administration is escalating its battle with Harvard University, blocking the university from enrolling international students. More than 6,700 currently enrolled foreign students would need to transfer or lose their legal status.