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Mark Halperin is speaking out after being accused of sexual harassment by five women.

The 52-year-old political journalist took to Twitter on Friday (October 27) to share his thoughts.

“I am profoundly sorry for the pain and anguish I have caused by my past actions,” he wrote. “I apologize sincerely to the women I have mistreated.”

“The world is now publicly acknowledging what so many women have long known: Men harm women in the workplace,” he continued. “The new awareness is, of course, a positive development. For a long time at ABC News, I was part of the problem. I acknowledge that, and I deeply regret it. As I said earlier in the week, my behavior was wrong. It caused fear and anxiety for women who were only seeking to do their jobs.”

“No one has sued me, no one had filed a human resources complaint against me, no colleague had confronted me,” he added. “But I didn’t need a call from HR to know that I was a selfish, immature person, who was behaving in a manner that had to stop.”

Read his full statement below.

READ MORE: HBO Drops ‘Game Change’ Miniseries Amid Mark Halperin Harassment Claims, Book Gets Canceled Too

HBO has decided to not move forward with an upcoming miniseries based partially on an upcoming book by political journalist Mark Halperin, who has been accused of sexually harassment by five women.

Halperin is the co-author of the book Game Change, which was turned a 2012 movie and won Emmys for Outstanding Miniseries or Movie and Outstanding Lead Actress for Julianne Moore, who played Sarah Palin.

The upcoming miniseries was slated to following the 2016 presidential election.

“HBO is no longer proceeding with the project tied to the untitled book co-authored by Mark Halperin and John Heilemann on the 2016 Presidential election,” HBO said in a statement (via Variety). “HBO has no tolerance for sexual harassment within the company or its productions.”

The book that he was planning to publish in 2018 has also been canceled.

“In light of of the recent news regarding Mark Halperin, the Penguin Press has decided to cancel our plans to publish a book he was co-authoring on the 2016 election,” the publisher announced.

Political journalist Mark Halperin, who has worked as political director at ABC News, commentator at MSNBC, and written a best-selling book called “Game Change,” has been accused of sexual harassment by five women.

“During this period, I did pursue relationships with women that I worked with, including some junior to me,” he said in a statement to CNN. “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.”

Women have been sharing accounts of what happened while working at ABC News years ago.

“I went up to have a soda and talk and — he just kissed me and grabbed my boobs,” one woman told CNN. “I just froze. I didn’t know what to do.”

“The first meeting I ever had with him was in his office and he just came up from behind — I was sitting in a chair from across his desk — and he came up behind me and [while he was clothed] he pressed his body on mine, his penis, on my shoulder,” another woman recounted. “I was obviously completely shocked. I can’t even remember how I got out of there — [but] I got out of there and was freaked out by that whole experience. Given I was so young and new I wasn’t sure if that was the sort of thing that was expected of you if you wanted something from a male figure in news.”

He’s been put on leave at MSNBC, where he’s most recently worked, indefinitely.