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A binder containing highly classified information related to Russian election interference went missing at the end of Donald Trump’s presidency, raising alarms among intelligence officials that some of the most closely guarded national security secrets from the US and its allies could be exposed, sources familiar with the matter told CNN.

Its disappearance, which has not been previously reported, was so concerning that intelligence officials briefed Senate Intelligence Committee leaders last year about the missing materials and the government’s efforts to retrieve them, the sources said.

The former president had ordered it brought there so he could declassify a host of documents related to the FBI’s Russia investigation. Under the care of then-White House chief of staff Mark Meadows, the binder was scoured by Republican aides working to redact the most sensitive information so it could be declassified and released publicly.

Instead, copies initially sent out were frantically retrieved at the direction of White House lawyers demanding additional redactions.

Just minutes before Joe Biden was inaugurated, Meadows rushed to the Justice Department to hand-deliver a redacted copy for a last review. Years later, the Justice Department has yet to release all of the documents, despite Trump’s declassification order. Additional copies with varying levels of redactions ended up at the National Archives.

But an unredacted version of the binder containing the classified raw intelligence went missing amid the chaotic final hours of the Trump White House. The circumstances surrounding its disappearance remain shrouded in mystery.

One theory has emerged about the binder’s whereabouts.

Cassidy Hutchinson, one of Meadows’ top aides, testified to Congress and wrote in her memoir that she believes Meadows took home an unredacted version of the binder. She said it had been kept in Meadows’ safe and that she saw him leave with it from the White House.

“I am almost positive it went home with Mr. Meadows,” Hutchinson told the January 6 committee in closed-door testimony, according to transcripts released last year.

A lawyer for Meadows, however, strongly denies that Meadows mishandled any classified information at the White House, saying any suggestion Meadows was responsible for classified information going missing was “flat wrong.”