He said of the phone conversation he had with the president after he withdrew his name, "It was terrible. … I was a wreck."
Afterward, Kerik said he felt like he needed to apologize to Giuliani, who he describes as "sort of like a father to me in one sense. He's like a brother in another, and he is one of my closest friends."
Kerik says he now recognized the impact of his personal actions on others, like Giuliani, who is said to be mulling a presidential run. "I think it has," he said of the nomination debacle. "I think it could."
But Kerik doesn't regret being nominated.
"Being nominated was the greatest honor of my lifetime. I didn't get there by a fluke. It wasn't an accident. And although I've made mistakes throughout my life, I don't think that should detract from what I am, who I am and what I've achieved throughout my life," he said.