In a flurry of tweets Saturday, President Trump defended his own mental stability and complained about author Michael Wolff's White House tell-all book Fire and Fury. After calling Wolff a "total loser" and slamming his controversial book, in which he reports that members of Trump's team have said they do not believe he is capable of functioning in the job, Trump went on to tout his own genius, saying, "throughout my life, my two greatest assets have been mental stability and being, like, really smart." He said his triumphs in business and politics prove he is "a very stable genius." On Friday, Secretary of State Rex Tillerson denied ever questioning the mental health of the president. "I've never questioned his mental fitness," Tillerson told CNN. "I have no reason to question his mental fitness."

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