Donald J. Trump doubled down on his claims of being a genius on Saturday by surrounding himself with the most intelligent people he knows and proclaiming himself “the smartest person in the room.” Referring to the associates gathered in the Oval Office as “my Brain Trust,” Trump said, “Every one of these people is a stable genius, and I am by far stabler and more geniuser than any of them.” Having conclusively proved how smart and stable he is, Trump said that he would spend the rest of the day proving how mature he is. “I’m, like, the most mature person in the country,” he said, “and anyone who says I’m not can suck it.”