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Sen. Rand Paul (R-Ky.) spoke to Fox News medical correspondent Dr. Marc Siegel in his first on-camera interview since he was assaulted outside his Kentucky home earlier this month.

Paul suffered six broken ribs and a buildup of excess fluid in his lungs when, according to the senator, a neighbor tackled him from behind while he was mowing his lawn.

"I was working in my yard with my ear muffs on to protect my hearing from mower. And I had gotten off the mower facing downhill, and the attacker came running," Paul said. "I never saw him, never had a conversation. In fact, the weird thing is I haven't talked to him in ten years."

Siegel asked if Paul has any idea what might have been going through the attacker's head.

"I didn't before the attack because we had no conversation. After my ribs were broken, then he said things to me to try to indicate he was unhappy," Paul said, adding that there isn't any justification for attacking someone from behind, whether it's over yard clippings or politics.

Siegel revealed that in the days after the attack, Paul developed pneumonia and had a 102.5 degree temperature, yet he still went back to work on Capitol Hill.

He still has several more weeks of using breathing machines and doing breathing exercises before he's fully recovered, Siegel said.

"His wife said that at night he struggles to breathe," Siegel said. "That's heroic as far as I'm concerned. It's nonpartisan and it's heroic. He's back at work, but he's still got a long road ahead of him."

This story has been corrected to reflect that this is the first time Paul has spoken on camera about the attack, not the first time he has spoken publicly.

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