In his first comments since joining the Federal Reserve Board, Stephen Miran sought to emphasize his independence from the White House.

© Cheriss May for The New York Times

The government filed an emergency request after a lower court prevented the president from firing Ms. Cook as the case proceeds.

© Eric Lee for The New York Times

The government filed an emergency request after a lower court prevented the president from firing Ms. Cook as the case proceeds.

© Eric Lee for The New York Times

The administration contested a preliminary injunction, issued late Tuesday, that temporarily blocked President Trump from firing her.

© Mark Schiefelbein/Associated Press