Warren Buffett told CNBC’s Liz Claman Thursday, after the release of his eagerly anticipated annual shareholder letter, that he’s deeply concerned about U.S. trade problems and predicts more weakness for the dollar.

“Mr. Buffett told me last night that the longer this goes on, the more severe the moment of truth will be, he also says you don’t know when that moment of truth is coming,” Claman said.