Michael Flynn, President Donald Trump's former security adviser, offered to testify at the investigation into Russian interference in the presidential election in exchange for immunity, his lawyer said late Thursday.

"General Flynn certainly has a story to tell, and he very much wants to tell it, should the circumstances permit," his lawyer Robert Kelner said in a statement.

Kelner said discussions between Flynn and the House and Senate Intelligence Committee had taken place but would not reveal the nature of the discussions.

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"No reasonable person, who has the benefit of advice from counsel, would submit to questioning in such a highly politicized, witch-hunt environment without assurances against unfair prosecution," Kelner said in the statement.

The Wall Street Journal reports that so far the FBI nor the committee have taken Flynn up on his offer.

Flynn was fired a month into his stint in the White House after it was revealed that he hadn't told the vice president about phone calls with the Russian ambassador.