Republican presidential candidate Sen. Lindsey Graham (R-SC) said Monday that he couldn’t believe he was losing to GOP rival Dr. Ben Carson, who, as Graham put it, once “tried to kill someone.”

Carson said Sunday that he was once, “very volatile” and shared a personal anecdote from his past.

“As a teenager, I would go after people with rocks, and bricks, and baseball bats, and hammers,” Carson said. “Of course, many people know the story when I was 14 and I tried to stab someone.”

Carson and fellow candidate Donald Trump have led in recent polls, a phenomenon that Graham responded to Monday on MSNBC’s “Morning Joe.”

Graham has consistently polled near the bottom among Republican nominee hopefuls.

“On our side, you’ve got the No. 2 guy tried to kill someone at 14 and the No. 1 guy is high energy and crazy as hell,” Graham said. “How am I losing to these people? Just look at Donald Trump’s foreign policy. What is it? What’s he going to do about ISIL? What is it? What is it? What is his game plan to destroy ISIL? Does anybody know?”

Graham went on to say that Trump’s foreign policy has changed throughout the campaign and shared his own plan to address international crises.

Watch Graham’s comment: