The Presidential Oath, contained in Article II, Section 1 of the United States Constitution, much like the office of president, goes along with some controversy, to the left is Lyndon Johnson’s inauguration on Air Force One on a flight back to Washington after JFK’s assassination. Some were outraged the photo was taken with Jackie Kennedy at his side, the reason for this according to Johnson was to show continuity of the Kennedy Administration. To the right is Barack Obama’s redo oath after Justice Roberts botches the oath causing Obama to mess up also.
Look into ways presidential diplomatic powers have changed foreign policy