Perdue said the controversy Chambliss triggered when he suggested he was open to breaking with conservative activist Grover Norquist's anti-tax pledge had been a "real net positive" for him, and dismissed talk that Chambliss could face a top-tier challenger as "rumors."

Republicans who haven't ruled out a bid against Chambliss include Georgia Reps. Tom Price and Paul BrounPaul Collins BrounCalifornia lawmaker's chief of staff resigns after indictment Republican candidates run against ghost of John Boehner The Trail 2016: Let’s have another debate! MORE as well as former Georgia Secretary of State Karen Handel.