WASHINGTON (AP) — If there were any doubt these are political times like none before, consider that the American president felt compelled Saturday to let the world know he's playing with all his marbles and is among the brightest cookies around. In a series of tweets, Donald Trump defended his mental fitness and boasted about brains, saying he is "like, really smart" and "a very stable genius." It was the latest pushback against a new book that portrays him as a leader who doesn't understand the weight of his office and whose competence is questioned by aides.