A new book by New York Times reporter Michael Schmidt claims Vice President Mike Pence was put on standby last November to take over the powers of the presidency when President Trump had to make an unannounced visit to Walter Reed hospital. Schmidt reports there was concern Trump would need to undergo a procedure that would have required him to be anesthetized. On Tuesday, Trump responded to the claim by writing on Twitter that he had not suffered a “series of mini-strokes” — that’s something Schmidt does not allege in the book. Pence says he does not recall being put on standby during the hospital visit.