During Cruz’s now-infamous 21-hour speech on the eve of the 2013 government shutdown, Paul came to the floor to speak for a few minutes about the health care law. But according to the book, Paul seemed intent on bolstering the GOP leadership’s “skeptical attacks,” which were “deliberately designed to undermine our efforts.”

“I marveled that Rand had decided not to be with us in this fight,” Cruz charges in “A Time for Truth.”

Paul, however, says that account isn’t exactly truthful.

“It’s curious because he sent me a really nice, handwritten congratulatory note thanking me for my help,” Paul told POLITICO last week. “I don’t understand.”