One set of powers that rests with the President is his ability to persuade people to do what he wants using his office and influence. These ‘powers of persuasion’ are incredibly useful in a system where checks and balances can often lead to gridlock. In this case, by inviting Senator McCain to the White House, it appears as if Senator McCain is an important individual, thereby lending him power. Further, allowing him to use the White House as a back drop for a press conference further enforces this image. The powers of persuasion should not be underestimated!