Right-wing author David Horowitz appeared on Glenn Beck’s show on Tuesday to talk about his most recent book, “Dark Agenda: The War to Destroy Christian America.” Beck read from the book’s closing lines declaring that a nation divided over fundamental principles like individual freedom versus group identity “cannot long endure” and concluding, “The urgency that drew the Religious Right into politics 50 years ago is now an urgency of the nation itself.”

A clip highlighted by the Beck’s The Blaze focuses on Horowitz’s take on slavery. It’s a stunning rewrite of America’s racial history, and one that, like many right-wing attempts at historical revisionism, ignores the long and violent imposition of Jim Crow apartheid in the former Confederate states after the Civil War—not to mention official and unofficial policies that have continued to perpetuate glaring racial disparities in opportunity, income, wealth and well-being.

In the clip, Horowitz starts with a slam at Cory Booker, U.S. senator and presidential candidate, for saying, in Horowitz’s telling, “we have to get rid of the bigotries in the Constitution.” Here’s how Horowitz responded: