Last week’s assassination of conservative activist Charlie Kirk has animated a wave of anti-Israel conspiracy theories, inspiring voices on both the far right and far left to join together in promoting an assortment of unsubstantiated claims inflected with conventional antisemitic tropes.

On Monday, Kirk’s producer and a billionaire supporter of Israel both rejected the allegations fueled by Max Blumenthal, a fiercely anti-Israel journalist promoted by Iranian state media who carries a long record of smearing the Jewish state.

Blumenthal, editor of the Grayzone website, published claims from anonymous sources that Kirk had been pressured at a Hamptons gathering hosted by billionaire Bill Ackman weeks before his death. Kirk was reportedly “hammered” over his views on Israel by Ackman and other pro-Israel advocates, leaving him to feel blackmailed.

The report named Natasha Hausdorff of UK Lawyers for Israel as among those who berated Kirk. Hausdorff confirmed to the New York Post that she attended the meeting but called the accusation “categorically untrue” and added that whoever said it “is absolutely lying.” Ackman also denied the charge, calling the claim “totally false.”

Blumenthal has long written articles sympathetic to Hezbollah, the former Assad regime in Syria, and Hamas. In 2013, he notably published Goliath: Life and Loathing in Greater Israel, which Eric Alterman, media columnist for the leftist flagship magazine The Nation, described as “a propaganda tract” that could “have been published by the Hamas Book-of-the-Month Club (if it existed).”

The Grayzone report has since influenced Candace Owens, the podcaster who has been widely accused of antisemitism, and US Rep. Marjorie Taylor Greene (R-GA), among others, demonstrating a convergence between far-left and far-right figures in promoting antisemitic narratives and anti-Israel conspiracies.

Owens — who previously worked with Kirk before her shift to open, unapologetic opposition to Israel and promotion of antisemitic conspiracy theories, which resulted in her termination from her job as podcaster at The Daily Wire in March 2024 — claimed during a Monday monologue that pro-Israel forces staged an “intervention” with Kirk involving Ackman and Israeli Prime Minister Benjamin Netanyahu. She alleged Kirk, an outspoken supporter of Israel who often called out the dangers of antisemitism, was changing his views and offered “a ton of money” to remain pro-Israel, comparing the meeting to a “re-education camp.” Owens said Kirk refused the offers, warning her followers to be “very wary and suspicious of the people who are already telling us to stop asking questions about the Charlie Kirk assassination.”

The podcaster later clarified that she was not directly accusing Israel of orchestrating the murder but argued Kirk had faced “extreme pressure” over his views. Owens also shared social media posts criticizing Netanyahu, captioning one with “All will be revealed.”

Ackman, founder of Pershing Square Capital Management, responded on X, saying Owens had “slandered” him by accusing him of staging an intervention and suggesting that he blackmailed Kirk. He denied ever offering Kirk or Turning Point USA, the political advocacy organization he started, any money, pressuring him on Israel, or threatening him. “In short, this was not an ‘intervention’ to ‘blackmail’ Charlie Kirk into adopting certain views on Israel,” Ackman wrote in his statement. He described his interactions with Kirk as cordial and said he admired him.

Ackman said he and Kirk first connected on Zoom in June, then worked together to organize a conference of conservative influencers in Bridgehampton in August. He said about 35 influencers attended, collectively reaching more than 100 million followers, and that discussions included a range of issues such as economics, dating, immigration, and Israel. He added that participants expressed varied views on Israel and US support for the country.

Andrew Kolvet, executive producer of “The Charlie Kirk Show,” corroborated Ackman’s account. In a statement, Kolvet said he had spoken with three Turning Point staffers who were present at the gathering in question and that “Bill never yelled at Charlie, never pressed him on Bibi [Netanyahu], never gave him a list of Charlie’s offenses against Israel.” Kolvet added that Kirk himself had told him he had a “cordial relationship” with Ackman and that the event was “productive.”

Despite those denials, the conspiracy theories gained further traction on the far right. Greene wrote on X that supporters should “believe Candace Owens and Tucker Carlson” over “Bibi Netanyahu (a foreign country’s leader),” before warning: “Do not allow a foreign country, foreign agents, and another religion tell you about Charlie Kirk. And I hope a foreign country and foreign agents and another religion does not take over Christian Patriotic Turning Point USA.” She described Kirk as a “Christian martyr” and suggested Jewish influence threatened his movement.

On July 28, Greene accused Israel of engaging in a genocide in Gaza.

The New York Post reported that Owens’ comments relied in part on Blumenthal’s Grayzone article. In addition, Owens suggested law enforcement had intentionally allowed Kirk’s killer to evade capture, though police have charged 22-year-old Tyler Robinson of Utah with the shooting.

Authorities have not presented any evidence linking Israel or pro-Israel figures to the crime. Rather, the alleged shooter’s animosity toward Kirk’s positions on LGBTQ issues appears to have inspired the attack, according to prosecutors.