The world's richest man, Amazon.com founder Jeff Bezos, has accused the National Enquirer's owner of trying to blackmail him over lewd pictures.
Mr Bezos said the magazine's parent company American Media Inc (AMI) wanted him to drop an investigation into how it obtained his private messages.
Mr Bezos and his wife, MacKenzie, said last month they were getting divorced.
Their announcement came just before the National Enquirer carried reports about the tech titan's extramarital affair.
AMI has not yet responded to the BBC's request for comment.
What does Bezos claim?
In a stunning blog post on Thursday, Mr Bezos posted an email he said had been sent to his intermediaries by AMI's representatives threatening to publish "intimate photos" of Mr Bezos and his lover, former TV host Lauren Sanchez.
The billionaire, who also owns the Washington Post, said AMI had wanted him to make a "false public statement" that the National Enquirer's coverage of him and his mistress was not politically motivated.
According to emails included by Mr Bezos in his blog, an AMI lawyer proposed on Wednesday that the photos would not be published in return for a public statement "affirming that [Bezos and his team] have no knowledge or basis" to suspect such a motive.
"Rather than capitulate to extortion and blackmail," wrote Mr Bezos, "I've decided to publish exactly what they sent me, despite the personal cost and embarrassment they threaten."
Early in the blog post, Mr Bezos mentions AMI's links to President Donald Trump.