President Donald Trump, unswayed by the BBC’s apology and resignations of its top officials, is persisting with his threat to sue the network for as much as $5 billion despite significant legal barriers to prove he was deliberately defamed.

“I think I have to do it,” Trump told reporters on Air Force One on Friday, continuing his quest to punish the British television network over an edit of his Jan. 6, 2021, speech that made it seem he was directly calling for violence at the US Capitol.