President Donald Trump named three justices in his first term, establishing a conservative supermajority on the Supreme Court. And now, even without an imminent vacancy, Trump is positioned to push the court farther to the right.

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,