President Donald Trump signed an executive order Monday revoking the security clearance of 51 former intelligence officials who signed a 2020 letter arguing that emails from a laptop belonging to Hunter Biden carried “all the classic earmarks of a Russian information operation” and that of his former national security adviser John Bolton.

President Trump said late Friday that he would bar his predecessor, President Biden, from receiving intelligence briefings traditionally given to former presidents, saying that Mr. Biden could not be trusted with sensitive information because a special counsel report concluded he had a “poor memory.