Trump signed the order on his second day back in office in January. The executive order sought to reinterpret the constitutional language that gives citizenship to nearly every child that is born in the U.S., regardless of their parents’ legal status.

Chief Justice John Roberts has led the Supreme Court 's conservative majority on a steady march of increasing the power of the presidency, starting well before Donald Trump's time in the White House.

A 1935 precedent that limited presidential powers is at issue in Monday's case, a challenge to the legality of President Donald Trump 's firing of an official in a federal agency set up by Congress wi...