Highlights from Ted Cruz's book 'A Time for Truth'

"A Time for Truth," Sen. Ted Cruz's new book, is out and is already sparking flames within the GOP.

In particular, Republican strategist and former George W. Bush staffer Karl Rove has taken great offense to what the Texas senator has said in the book.

Rove's particular criticism stems from Cruz's bid for the Texas Attorney General's seat, the Dallas Morning News reports. Cruz wrote that in 2009, he went to former U.S. President George H.W. Bush's home for advice and ended up winning an endorsement. Rove was reportedly furious, and sent him this email.

"Thanks — I appreciate your doing what you can to keep this down — the distress you mention is not mine or 43 — it is the people raising money for the library who are also [Dan] Branch fans and will not understand why one part of the Bush family is for not-the-guy while they are raising money big bucks for library."

Cruz opted not to run for the attorney general's seat when it became clear Greg Abbott was running for reelection. Dan Branch ran against Ken Paxton in 2013 and was defeated by a significant margin.

Rove has since gone on to deny Cruz's narrative and threw in a jab at the freshman senator, saying he advised him to stop calling himself the "next Marco Rubio."