Billy Bush says that he was motivated to write his recent op-ed firing back at President TrumpDonald John TrumpChelsea Clinton announces birth of third child Ukrainian officials and Giuliani are sharing back-channel campaign information: report Trump attacks 'the Squad' as 'racist group of troublemakers' MORE for reportedly claiming that it wasn't him on the 2005 “Access Hollywood” tape after reading the accounts of women who have accused Trump of sexual misconduct.

The former “Access Hollywood” host, who was fired by NBC News shortly after the tape of Trump bragging to him about groping and kissing women without their consent emerged, said on “The Late Show with Stephen Colbert” Monday that he had his “own personal problem” with Trump reportedly claiming that the tape might be fake.

But Bush said his issues with the report were compounded by the women who have accused Trump of sexual misconduct.

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“All these women came out with their names and told their detailed accounts,” Bush said. “So when he said this it infuriated me on a personal front, but then I ended up Googling and I found an article with all these women’s accounts.”

The former host said that he hadn’t read up on the accusations against Trump when they first emerged because he had recently been fired, but that he has been reading up on the allegations in the past few days.

“I said, 20 women don’t get together and say, ‘you know what would be really fun, let’s take down a powerful guy together.’ No, they don’t,” Bush said.

“I said, ‘OK, you’re reopening wounds on them too. Enough’s enough, stop playing around with people’s lives.’

“That upset me.”

Bush’s appearance on Colbert came one day after he published an op-ed in The New York Times accusing Trump of “indulging in some revisionist history” by reportedly telling others that the voice in the “Access Hollywood” tape wasn't his.

"He said it. 'Grab ‘em by the p----,' " Bush wrote in the op-ed. 

"Of course he said it. And we laughed along, without a single doubt that this was hypothetical hot air from America’s highest-rated bloviator. Along with Donald Trump and me, there were seven other guys present on the bus at the time, and every single one of us assumed we were listening to a crass standup act. He was performing. Surely, we thought, none of this was real," Bush wrote.

"We now know better.”