Former president Ronald Reagan addresses the guests at the dedication ceremony for his presidential library in Simi Valley, Ca. Nov. 4, 1991.  (AP Photo/Marcy Nighswander)

A biographer of former President Ronald Reagan said some scenes in “Lee Daniels’ The Butler” may amount to what he describes as “Hollywood malpractice” if they turn out to be based on anything other than facts.

Paul Kengor, who wrote two books about the late president: “The Crusader” and “God and Ronald Reagan,” took particular issue with a scene in which Nancy Reagan invites White House butler Cecil Gaines and his wife to a dinner party only for the couple to feel out of place, according to The Hollywood Reporter.

“The screenwriter and makers of this film better have some hard evidence for this,” Kengor told the publication. “I hope they have at least some quotes somewhere from the butler saying he felt like a prop. If they don’t, then they should be ashamed of themselves. If they don’t, then this is Hollywood malpractice.”