President Donald Trump has challenged Secretary of State Rex Tillerson to a duel, suggesting that he and his beleaguered adviser match scores from their respective IQ tests to see who's smarter. To be fair to the president, Tillerson has reportedly called Trump a "moron." Even away from Trumplandia, that's a fighting word.Trump was talking so much about his IQ way back in the early 2000s, when I covered him as a reporter and then spent time with him for a biography, that I once asked him for evidence of his lofty scores. He never produced anything. Trump's insecurity about his intellect is one of the constants of his journey on the public stage over the last several decades. (The other two legs of Trump's insecurity stool are his sex appeal and the scope of his wealth; Trump sued me for questioning the latter, a case he lost in 2011.) Trump's bragging about his brain was also a hallmark of the 2016 presidential campaign, and beyond. "I’m speaking with myself, number one, because I h...

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