Trump framed the new restrictions, which primarily target African and Asian countries, as necessary to fortify national security and combat terrorism.

A sweeping new travel ban on citizens from a dozen nations was announced by the White House on Wednesday, reviving a defining effort from the first Trump administration to crack down on entries from specific countries.

The addition of visa overstays as a rationale could provide an opening for new legal challenges, migrant advocates say.

On Wednesday, President Donald Trump signed a directive seeking to block U.S. entry for Harvard’s international students. It marked the administration’s latest effort to squeeze Harvard’s foreign enrollment after a federal judge in Boston blocked the withdrawal of its certification to host students from overseas.

A Guatemalan man identified as O.C.G. has been flown back to the United States after a judge determined he had been wrongfully deported to Mexico without the chance to contest his removal.

The man, who had been deported to Mexico, is the first known deportee to be returned by the Trump administration after a judicial order.