A number of reports say that president Trump visited the Walter Reed Army Medical Center on Saturday for several hours.
https://heavy.com/news/2019/11/trump-chest-pain/
Conflicting explanations have been offered by various White House sources, some saying that the president was taking part of his routine annual physical examination early (it normally takes place in February), others suggesting he was visiting the family of a young serviceman.
The report that went viral however, was a claim on Twitter by Andrew Vernon who is an op-ed writer for The Hill saying that according to his sources the president was suffering chest discomfort.
Andrew Vernon has drawn heavy flak on Twitter and elsewhere for reporting this claim which isn’t supported by other media, but it turns out that he may have better credentials than his critics imagine.
According to an article on him by the University of Maine, Vernon used to work at the Veterans Administration in the position of “coordinator and cardio-pulmonary rehabilitation therapist with the Physical Medicine and Rehabilitation Service.”
https://umaine.edu/news/blog/2019/07/15/andrew-vernon-army-veteran-and-kpe-alum-fights-to-raise-awareness-about-veteran-suicides/
CNN are carrying a report saying that the president’s visit to Walter Reed did not follow the protocol of a routine presidential medical visit. There were no prior general notications to staff at the center, and no partial shut-down of the facility to facilitate security.
https://edition.cnn.com/2019/11/17/politics/trump-physical-walter-reed-protocol-routine-presidential-visit/index.html
Several experts familiar with White House medical procedures said that Trump can get routine labwork done at the White House's on-site clinic, indicating Trump needed tests that can't be done there.