“No new president has ever had to fear that his predecessor might expose the nation's secrets as President-elect Joe Biden must with Trump, current and former officials said. Not only does Trump have a history of disclosures, he checks the boxes of a classic counterintelligence risk: He is deeply in debt and angry at the U.S. government, particularly what he describes as the ”deep state“ conspiracy that he believes tried to stop him from winning the White House in 2016 and what he falsely claims is an illegal effort to rob him of reelection. ...

”Many concerned experts were quick to note that Trump reportedly paid scant attention during his presidential intelligence briefings and has never evinced a clear understanding of how the national security apparatus works. His ignorance may be the best counterweight to the risk he poses.“

-- from ”As an ex-president, Trump could disclose the secrets he learned while in office, current and former officials fear," by Shane Harris, in The Washington Post