"Fascinating to watch people writing books and major articles about me and yet they know nothing about me & have zero access. #FAKE NEWS!" President Trump tweeted Tuesday. 

But who was the target of the president's online ire? Politico notes Hillary Clinton is a possibility, having released her new book, What Happened, on Tuesday. 

But Fox News believes there's a likelier candidate: NBC political reporter Katy Tur, who also released a new book, Unbelievable: My Front-Row Seat to the Craziest Campaign in American History, on Tuesday. To mark the occasion, Tur gave interviews on NBC's Today and MSNBC's Morning Joe, where it's entirely possible the morning-show-loving Trump saw her.

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