Meanwhile, Pulitzer Prize-winning historian David McCullough and award-winning filmmaker Ken Burns have teamed up to launch the group Historians on Donald Trump. Their Facebook page includes a series of prominent historians speaking about the dangers of a Trump presidency.

David McCullough: “So much that Donald Trump spouts is so vulgar and so far from the truth and mean-spirited. It is on that question of character especially that he does not measure up. He is unwise. He is plainly unprepared, unqualified and, it often seems, unhinged. How can we possibly put our future in the hands of such a man?”

That’s historian David McCullough, speaking about Donald Trump. The two-time Pulitzer Prize winner for the biographies “Truman” and “John Adams” has historically refused to comment on contemporary election cycles, saying his specialty is “dead politicians.” Other historians involved in the group include Ron Chernow, whose Pulitzer Prize-winning biography “Hamilton” served as inspiration for the hit musical, and Vicki Lynn Ruiz, former president of the American Historical Association.