President Donald Trump has signed a proclamation to suspend international visas for new students at Harvard University, the White House announced Wednesday, in a dramatic escalation of its efforts to block foreign nationals from enrolling at the elite university.

The proclamation also directed the secretary of state to consider revoking the visas of foreign students already in the U.S. to study at Harvard. "I have determined that the entry of the class of ...

As President Donald Trump and his team dialed up the pressure on Harvard University last month, threatening to bar its international students, the school issued what was at once a warning and a plea.

The Trump administration’s fights with Harvard and Columbia are eye-openers for other universities who are trying to decipher how to handle the president and his desire to exert control over their policies.