The House Intelligence Committee’s top Democrat says a request by the fired US national security adviser for immunity to testify to the panel is “momentous”.
Representative Adam Schiff said they were interested in hearing Michael Flynn’s evidence, but it was too early to shield him from any prosecution.
Two congressional committees and the FBI are investigating alleged Russian meddling in the US election.
Mr Flynn’s ties with Russia have been under scrutiny.
The retired army lieutenant general was sacked in February after misleading the White House about a conversation he had with the Moscow ambassador shortly after the election.
On Thursday night, his lawyer said in a statement that his client “has a story to tell” to the Capitol Hill inquisitors.
But the attorney added it would not be reasonable to submit to questioning in a “witch-hunt environment” without assurances against “unfair prosecution”.