A binder holding top-secret intelligence that contributed to a US assessment that Russia tried to help throw the 2016 US election to Donald Trump has been missing since the last days of his presidency, a source familiar with the issue said.

The Russia intelligence was included with other documents in a binder that Trump directed the CIA to send to the White House just before he left office so he could declassify materials related to the FBI probe of Russian interference in the 2016 vote, the source said.

The Russia materials included highly classified raw intelligence gathered by the US and NATO allies, fuelling fears that the methods used to collect the information could be compromised.

The source said the binder contained other information related to the FBI’s “Crossfire Hurricane” investigation, including materials on the origins of the probe collected by Trump aides and botched FBI applications for wiretap warrants.

They also included anti-Trump text messages between Peter Strzok and Lisa Page, FBI officials who were involved in the probe, the source said.

Political motives

Trump’s presidential campaign did not immediately respond to a request for comment.

The Office of the Director of National Intelligence in January 2017 released an assessment that found Russian President Vladimir Putin and his government conducted a campaign of disinformation and cyberattacks to “help … Trump’s election chances” by denigrating his Democratic foe, Hillary Clinton. Russia denies interfering in the election.

The disappearance of the binder ignited such deep concerns that the government last year briefed the Senate intelligence committee, the source said.

Facing multiple charges, Donald Trump could spend his final years behind bars. Photo: AP

In a federal court document filed in August by John Solomon, a conservative journalist, the binder was described as 25 centimetres thick.

Trump appointed Solomon to be a representative authorised to access records from his presidency in the National Archives.

The court document said Mark Meadows, who served as Trump’s last chief of staff, was involved in handling the missing binder and developing with Solomon a strategy to release the materials that Trump planned to declassify.

Trump has repeatedly called the FBI investigation a hoax.

Vanished in transit

Solomon’s federal court filing said that just before Trump left office after his defeat by US President Joe Biden, Solomon was told by Meadows that Trump intended to order the declassification of the Crossfire Hurricane materials in the binder.

Two days before his term ended, the document said, Trump and Meadows told Solomon that the binder had been declassified.

On January 19, Meadows invited Solomon to the White House to review several hundred declassified pages and discuss the materials’ public release, it said.

Copies were provided to Solomon. As he began preparing a story for his website, it continued, the White House called to ask that copies be returned for additional redactions.

“Meadows promised Solomon that he would receive the revised binder,” the document said.

“This never happened.”

There has been no trace of the classified version since then.

-AAP