Asked last week about the brewing matchup, Paul told POLITICO he viewed Enzi as a solid conservative.

Paul and Cheney stand at opposite poles of the conservative national security debate, with Cheney supporting a hawkish foreign policy and Paul openly questioning the value of American military action overseas, and advocating for cuts to the defense budget.

Cheney’s father, former Vice President Dick Cheney, endorsed Rand Paul’s primary opponent in the 2010 Kentucky Senate race.