Former White House national security adviser Michael Flynn provided the Senate Intelligence Committee with over 600 pages of documents, CNN reported Tuesday.

While most of the documents included business records, some were also personal files that Flynn provided "based on the narrowed requests from the committee,” a source familiar with the matter told the news outlet.

The Senate panel issued a second subpoena on Flynn’s businesses after he invoked his Fifth Amendment right against self-incrimination following the first individual subpoena.

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Flynn handed in the documents on the last day of the deadline to the committee in order to comply with the subpoena.

The House Intelligence Committee has also issued a subpoena on Flynn’s businesses, which is leading its own investigation into Russia’s possible election interference.

Both congressional and federal probes are looking into Flynn’s ties to Russia.

Flynn will likely be at the center of FBI Director James Comey’s testimony before the Senate panel on Thursday.

The New York Times reported last month that President Trump asked Comey to let “go” of his investigation into the former intelligence head.

Comey also reportedly maintained a paper trail to document what he saw as the president’s improper attempts to influence his agency’s investigation.

Senate Intelligence Chairman Richard Burr Richard Mauze BurrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs Rep. Mark Walker says he's been contacted about Liberty University vacancy MORE (R-N.C.) said the panel rejected Flynn proposed deal to testify in exchange for immunity.

ABC News reported Tuesday that Comey is likely to stop short of saying Trump obstructed the investigation.