National security adviser General Michael Flynn delivers a statement daily briefing at the White House in Washington U.S., February 1, 2017. REUTERS/Carlos Barria

The Wall Street Journal is reporting that Mike Flynn, President Donald Trump’s former national security adviser, has told the Federal Bureau of Investigation and congressional officials investigating the Trump campaign’s potential ties to Russia that he is willing to be interviewed in exchange for a grant of immunity from prosecution, according to officials with knowledge of the matter.

Flynn made the offer to the House and Senate Intelligence Committees and the FBI via his lawyer but has not succeeded in striking a bargain, according to the Wall Street Journal report, which cited unnamed officials with knowledge of the matter.

The House and Senate Intelligence Committees are in the midst of separate ongoing investigations into Russian interference in the 2016 election.

Flynn resigned as national security advisor in February after reports revealed that he spoke about Obama-era sanctions in a call with Russian Ambassador Sergey Kislyak before President Donald Trump’s inauguration. This contradicted members of Trump’s administration, including Vice President Mike Pence, who previously denied that Flynn and Kislyak discussed sanctions.