A key FBI informant in the widely-debunked Russia collusion case was paid nearly $1.2 million over three decades, was motivated in part by "monetary compensation," and continued snitching even after agents concluded he told them an inaccurate story about future Trump National Security Advisor Mike Flynn, newly declassified documents show.

The nearly 700 pages of once-secret documents, obtained by Just the News, were recently turned over by FBI Director Kash Patel to House Judiciary Committee Chairman Jim Jordan after President Donald Trump ordered them declassified at the start of his second administration.

They provide the most extensive portrait yet of former FBI informant Stefan Halper, a Pentagon consultant and academic who, along with retired British intelligence agent Christopher Steele, was used by bureau agents to build the Crossfire Hurricane case against Trump and his advisers during the end of the 2016 election and the beginning of Trump's first term in office.

The memos confirm Halper was the source of one of the most sensational bogus claims to land in the FBI's probe in summer 2016: that Flynn had left a 2014 foreign meeting alone with Russia scholar Svetlana Lokhova when he was a three-star general leading the Defense Intelligence Agency.

FBI agents ultimately deemed Halper's account to be "not plausible" and "not accurate", but the bureau proceeded to investigate Flynn, kept paying Halper and continued to vouch for his veracity as a confidential human source codenamed "Mitch," the memos show.