Former President and Republican presidential nominee Donald Trump threatens to imprison billionaire entrepreneur and founder of Facebook Mark Zuckerberg in his new book, Save America.

Underneath a picture of Zuckerberg meeting with Trump at the White House during the latter’s presidency, Trump writes that Zuckerberg “would come to the Oval Office to see me” and “bring his very nice wife to dinners, be as nice as anyone could be, while always plotting install shameful Lock Boxes in a true PLOT AGAINST THE PRESIDENT.”

Then came the threat:

He told me there was nobody like Trump on Facebook. But at the same time, and for whatever reason, steered it against me. We are watching him closely, and if he does anything illegal this time he will spend the rest of his life in prison — as will others who cheat in the 2024 Presidential Election.

Zuckerberg recently addressed a letter to House Judiciary Committee Chairman Jim Jordan (R-OH) in which he admitted that the company had made a mistake when it demoted The New York Post‘s controversial story about Hunter Biden’s laptop in October 2020 after being warned about Russian disinformation effort against the Bidens by Trump’s FBI.