Right-wing provocateur Milo Yiannopoulos has been disinvited to this year's Conservative Political Action Conference (CPAC) after his attempt to clarify past comments on relationships between boys and older men fell flat with organizers.

Hours later, his publisher cancelled his book "Dangerous," which had been scheduled to come out in June.

In a tweet Monday afternoon, Matt Schlapp, chairman of the American Conservative Union (ACU), which founded and hosts CPAC, said that "due to the revelation of an offensive video in the past 24 hours condoning pedophilia, the American Conservative Union has decided to rescind the invitation of Milo Yiannopoulos to speak."

"@ACUConservative has decided to rescind the invitation of Milo Yiannopoulos to speak at #CPAC2017." pic.twitter.com/sVWGnPCW7C — Matt Schlapp (@mschlapp) February 20, 2017

The initial invitation of the polarizing Breitbart News editor sparked backlash. The conservative Reagan Battalion blog tweeted video clips Sunday in which Yiannopoulos discussed Jews, sexual consent, statutory rape, child abuse and homosexuality.

In one clip, Yiannopoulos defends sexual relationships between men and boys as young as 13 years old. He also speaks approvingly of his own sexual relationship with a 29-year-old priest when he was 17.

"In the homosexual world, particularly, some of those relationships between younger boys and older men — the sort of 'coming of age' relationship — those relationships in which those older men help those young boys discover who they are and give them security and safety and provide them with love and a reliable, sort of rock, where they can't speak to their parents," he said.

Yiannopoulos has since apologized for his phrasing and clarified that he opposes pedophelia.

Later Monday, Simon & Schuster and its Threshold Editions imprint announced that "after careful consideration" they had pulled Yiannopoulos' book, for which pre-orders placed it high on Amazon.com's best-seller lists. The subject of intense controversy from the start, "Dangerous" was originally scheduled to come out in March. But Yiannopoulos pushed back the release to June so he could write about the protests and cancelled appearance at the University of California, Berkeley during his recent campus tour.

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At the time of his publisher's decision Monday, "Dangerous" ranked No. 83 on Amazon's overall list and No. 1 in the subcategory of "Censorship & Politics."

Simon & Schuster did not offer any specific reason for pulling "Dangerous." In Facebook postings Monday night, Yiannopoulous wrote: "They canceled my book" and "I've gone through worse. This will not defeat me."

Yiannopoulos is known for his vicious criticism of women and Muslims, among others. Last summer, he helped instigate a harassment campaign against "Ghostbusters" star Leslie Jones that led to his banishment from Twitter.

More than 100 Simon & Schuster authors had objected to his book deal, which was announced last December, and prominent feminist writer Roxane Gay withdrew a planned book. Some bookstores had said they would not sell it, although the National Coalition Against Censorship and other free speech organizations had defended the publisher. Threshold is a conservative imprint that has published books by President Donald Trump, who has defended Yiannopoulos, and former Vice President Dick Cheney, among others.

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On Facebook, Yiannopoulos blamed deceptive editing and his own "sloppy phrasing" for any indication he supported pedophilia. The British author said he spoke of his own relationship when he was 17 with a man who was 29. The age of consent in the United Kingdom is 16.

It's unclear who edited the videos.

Yiannopoulos had responded to the video and criticism on Sunday with a statement on Facebook. After Schlapp announced that the editor's invitation to speak at CPAC was rescinded, Yiannopoulos posted a revised statement on Monday afternoon that reiterated his opposition to child abuse. However, it did not directly address CPAC.

"My own experiences as a victim led me to believe I could say anything I wanted to on this subject, no matter how outrageous," Yiannopoulos wrote. "But I understand that my usual blend of British sarcasm, provocation and gallows humor might have come across as flippancy, a lack of care for other victims or, worse, 'advocacy.' I deeply regret that."

Schlapp, possibly referring to Yiannopoulos' initial statement on Sunday, said in his tweet: "We realize that Mr. Yiannopoulos has responded on Facebook, but it is insufficient. We urge him to immediately further address these disturbing comments.

"There is no disagreement among our attendees on the evils of sexual abuse of children."

Schlapp initially said the invitation had been extended knowing that free speech on college campuses is a "battlefield where we need brave, conservative standard-bearers."

Breitbart is considered by many a platform for the so-called "alt-right" movement, an offshoot of conservatism that mixes racism, white nationalism and populism. Its former executive chairman, Steve Bannon, is now a senior adviser to President Donald Trump.

CPAC will be held Wednesday through Saturday at the Gaylord National Resort at National Harbor. Schlapp also tweeted Monday that President Donald Trump will speak at the conference on Friday morning.

Vice President Mike Pence, Steve Bannon, Reince Priebus, Sean Hannity, Gov. Scott Walker and Sen. Ted Cruz are also among the scheduled speakers.