President Donald Trump's ability to reshape federal agencies that were meant to be independent from the White House will be tested on Friday as a U.S. appeals court considers whether he can remove Democratic members from two federal labor boards.

The US Supreme Court on Thursday heard arguments over whether individual federal judges can block Donald Trump’s executive orders across the country. It is the first time the court has weighed in on whether judges in lower courts can block the president’s policies nationwide and could have wide-ranging implications for Trump’s ability to implement his second-term agenda.

President Donald Trump is pressing the US Supreme Court to use a dispute over one of his most audacious immigration initiatives as a way to constrain the judges who keep thwarting his agenda.