President Trump's criticism reversed his administration's previous support for the deal, in which Britain relinquished control of the Chagos Islands, site of a joint U.S.-British base.
If the Supreme Court rules against its tariffs, the Trump administration would begin replacing them immediately, said Jamieson Greer, the United States Trade Representative.
The U.S. Supreme Court on Monday handed President Donald Trump a defeat in his legal showdown with the most-populous U.S. state, declining to hear his administration's challenge to "sanctuary" laws in California that protect immigrants from deportation.
