“I am not going to order that the plane turn around,” said the judge, Brian E. Murphy of the Federal District Court in Boston. Instead, he said, any migrants in Department of Homeland Security custody must not leave U.S. control once the plane landed, at least until a hearing Wednesday to determine whether they had received adequate due process.

South Africa’s President Cyril Ramaphosa will hold crucial talks at the White House with US President Donald Trump on Wednesday in a high-stakes meeting that could improve or deteriorate already frosty relations between the nations.

South Africa’s visit to Washington to reset relations with Donald Trump is not expected to deliver a resumption of aid to fight the HIV epidemic, public health experts have said.