Republican Sen. Lindsey Graham is a leading advocate of U.S. intervention in the Syrian civil war. Graham is up for re-election in 2014, and so far he is facing three challengers in the Republican primary, none of whom are thought at the moment to represent a serious threat to his election prospects. But those three challengers — Nancy Mace, best known as the first woman to graduate from The Citadel; Lee Bright, a Republican state lawmaker; and businessman and evangelical Richard Cash — are all lining up to oppose the U.S. intervention that Graham favors. I asked for their response to Graham’s position, and here are their answers.

“I find no compelling national security reason to engage our military in Syria,” wrote Mace via email: