The president solidified his grip on the performing arts complex as the center’s longtime president, Deborah F. Rutter, was fired.

The stop-work order on U.S.A.I.D.-funded research has left thousands of people with experimental drugs and devices in their bodies, with no access to monitoring or care.

Amid a deluge of executive actions, the Trump administration has directed federal health agencies to pause external communications, such as regular scientific reports, updates to websites and health a...