From the New York Times review:
There are many arresting details in the book. We learn that the administration holds particular animus for exactly what it calls “D. O.J. girls,” or girls who work in the Justice Department. Wolff writes that following the white supremacist mayhem at Charlottesville, Va., Trump privately rationalized “why someone would be a part of the K.K.K.”
Many believe the anecdotes and quotes in Wolff’s book ought to be treated with a healthy dose of skepticism, but that one is not implausible. Trump went to the album in the wake of the Charlottesville white supremacy march that left Heather Heyer dead, stating he believed there were “good people” on both sides of the protest, one side of that had been rife with Neo-Nazis and white supremacists.
Trump was widely criticized for the response, which many considered a tacit endorsement of white supremacy.
Throughout his presidential campaign, a classic New York Times narrative was discovered that reported Trump’s father, Fred, back in 1927, was detained at a rally in 1927 at which KKK members were present. It was never proven if he had been participating in the rally or even a part of the group.