Former Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE reportedly believes that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE's son-in-law and senior adviser Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE was responsible for pushing rumors of his long-anticipated ouster.

The former top diplomat suggested in an interview with The New Yorker that he knows who was behind long-simmering rumors that he would be fired, but did not provide a name. Multiple sources, however, told the magazine that he believes it is Kushner.

"I know who it is," Tillerson told The New Yorker. "I know who it is. And they know I know."

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Tillerson's comments came after he was unceremoniously fired by Trump in March via Twitter. Rumors of his pending dismissal had circulated for months prior to that.

His firing came amid particularly high tensions with Kushner, who has been charged with brokering a peace plan between the Israelis and Palestinians.

The tensions, according to The New Yorker, were manifested in a bitter public relations fight.

For example, after Tillerson secured some of the funding for the United Nations Relief and Works Agency, which U.S. Ambassador to the U.N. Nikki Haley Nimrata (Nikki) Haley'The soul' versus 'law and order' Author Ryan Girdusky: RNC worked best when highlighting 'regular people' as opposed to 'standard Republicans' GOP lobbyists pleasantly surprised by Republican convention MORE had threatened to withhold, news items discussing the potential negative consequences of the move for Middle East peace began to emerge.

A State Department official blamed Kushner for planting those items, The New Yorker reported.

Still, Tillerson insisted that there was no animosity with Kushner over his foreign policy portfolio. He said that it had been understood since the early days of Trump's presidency that Kushner would oversee Middle East peace.

"It was pretty clear in the beginning the president wanted him to work on the Middle East peace process, and so we carved that out." Tillerson said. "That’s what the president wanted to do."