Conservative firebrand Milo Yiannopoulos ripped the Washington Metropolitan Area Transit Authority’s (WMATA) decision to pull billboards promoting his new book in comments to the Washingtonian on Friday.

“Shocking no one, the Washington D.C. Metro—the public transportation system of the swamp itself—has banned ads for my book,” he writes. “You already knew the mainstream media doesn’t want you to read Dangerous, now you can add the government to that list,” Yiannopoulos wrote in an email to Washingtonian.

“What leftists fail to realize is that every banned ad, every negative review, and every nasty article about me is a ringing endorsement to the people that really matter—real Americans,” he continued.

According to Washingtonian, WMATA told Yiannopoulos that his ad violated two of its rules regarding advertising: “Advertisements that are intended to influence public policy are prohibited, as well as “advertisements intended to influence members of the public regarding an issue on which there are varying opinions are prohibited.”

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The Hill has reached out to WMATA for comment.

A WMATA spokesman told Washingtonian that Yiannopoulos’s ad, which features his face on a red and blue picture with the book’s title, “Dangerous,” violated its guidelines.

The news comes a day after the right-wing personality filed a $10 million lawsuit against Simon & Schuster after it canceled his six-figure book deal.

Yiannopoulos self-published “Dangerous” on Amazon last week, becoming the No. 1 bestseller and No. 1 new release on the website, according to Publishers Weekly.

The former Breitbart columnist is no stranger to controversy, garnering attention for his remarks on feminism, race relations, free speech and other hot-button political issues.