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President Trump is quite a fan of calling people "dumb as a rock," having used the insult against nearly a dozen people on Twitter over the past few years.
The full list of Trump's targets: Rex Tillerson, Mika Brzezinski, Don Lemon, Glenn Beck, Rick Wilson, Chris Matthews, Bill Maher, Jonah Goldberg, Bryant Gumbel, Jay Leno, Touré, Jeb Bush.
Go deeper: Trump's "Pocahontas" power play