"That's the one I'm prepared to be specific about," he said in reference to the Senate Conservatives Fund, which he said "has elected more Democrats than the Democratic Senatorial Committee over the last three cycles."
"Right now they're on the air in obvious coordination with Harry Reid's super PAC—Harry Reid's!—in the same markets, at roughly the same amount, at the same time," McConnell added.
His GOP challenger Matt Bevin won the Senate Conservatives Fund's endorsement last month, but McConnell made it clear that he's not sweating his primary challenger.
"I don't wanna be overly cocky, but I'm gonna be the Republican nominee next year," McConnell said.
Polls thus far indicate that McConnell is the heavy favorite over Bevin, but the incumbent could have his hands full in a general election against Democrat Alison Lundergan Grimes.