quote:

President Donald Trump has required personnel at the Walter Reed National Military Medical Center to sign nondisclosure agreements before they could be involved with treating him, according to four people familiar with the process.

During a surprise trip to Walter Reed on Nov. 16, 2019, Trump mandated signed NDAs from both physicians and nonmedical staff, most of whom are active-duty military service members, these people said. At least two doctors at Walter Reed who refused to sign the NDAs were subsequently not permitted to have any involvement in the president's care, two of the people said.

The reason for his trip last year remains shrouded in mystery.