On Oct. 26, Halperin had been suspended from working for the network in the wake of sexual harassment allegations levied against him.
According to CNN, Halperin is said to have harassed up to five women during his tenure as ABC News political director more than a decade ago. Those detailed accounts include junior employees being propositioned for sex, as well as kissing and groping against their will.
“We find the story and the allegations very troubling,” MSNBC said in a statement. “Mark Halperin is leaving his role as a contributor until the questions around his past conduct are fully understood.”
In response to the initial CNN report, Halperin released a statement of his own, which reads as follows:
During this period, I did pursue relationships with women that I worked with, including some junior to me. I now understand from these accounts that my behavior was inappropriate and caused others pain. For that, I am deeply sorry and I apologize. Under the circumstances, I’m going to take a step back from my day-to-day work while I properly deal with this situation.
ABC News said that no complaints were filed against Halperin during his tenure. On Thursday morning, Morning Joe co-host Mika Brzezinski addressed the allegations, saying, “We are going to be following this story as it develops [and] I’m sure we are going to be talking about it again when we know more about it.”
Following his time at ABC News, Halperin became an NBC News analyst, putting in frequent appearances on the aforementioned Morning Joe. He also co-authored the book Game Change, which was adapted into an HBO original movie starring Julianne Moore as 2008 Republican vice presidential candidate Sarah Palin. In 2016, he began co-hosting the Showtime docuseries The Circus: Inside the Greatest Political Show on Earth, chronicling the 2016 presidential election and its aftermath. Its sophomore run concluded on May 7. It has yet to be renewed for a third season.
UPDATE: HBO will no longer develop Halperin and John Heilemann’s to-be-published book about the 2016 presidential election, our sister site Deadline reported Thursday. In a statement, the pay cabler said, “HBO has no tolerance for sexual harassment within the company or its productions.”