"Some interesting tidbits about the White House Physician". In particular, #5 (no need to be truthful to American public) and #12 (triage priority):
5. White house physicians have no duty to be truthful with the American public. Historically, they have often deceived the public about the state of the President's health. This goes back to George Washington - when he had a massive boil on his ass, the doctor who lanced it reported that it had been on his leg. Woodrow Wilson's doctor helped cover up a massive stroke, then conspired with the first lady to secretly run the government themselves while denying everyone else access to the bedridden President.
12. Triage is by importance, not severity. The president comes first. If a bystander is bleeding out from a bullet wound and the president is barely grazed, all attention goes first to the President. So don't have a heart attack in the White House at the same time as the VP gets a sunburn!