President Donald Trump will need the Supreme Court, with three justices he appointed, to enable the most aggressive of the many actions he has taken in just the first few weeks of his second White House term.

Trump administration officials have criticized federal court rulings over policies that could lead to showdown over executive power.

The whirlwind of unilateral action on his campaign promises has pushed the limits of presidential power – and prompted legal challenges from Democrats, unions and legal groups. So far the federal courts have been the only substantive roadblocks to Trump's agenda,