Elon Musk could renege on a longstanding pledge to give his fortune away to charity, at the urging of fellow right-wing billionaire Peter Thiel.

According to transcripts and audio of lectures reviewed by Reuters, tech investor Thiel said he had urged the world’s richest man to rethink his adherence to the Giving Pledge, warning him that some of his wealth would go “to left-wing nonprofits that will be chosen by Bill Gates.”

Thiel was speaking in September during a four-part closed-door lecture series in San Francisco.

Musk signed on to the Giving Pledge in 2012, two years after it was co-founded by Gates, the Microsoft billionaire who was then the world’s richest man. It calls on signatories to commit a large portion of their wealth to charitable causes either during their lifetime or

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