Wall Street Journal, citing officials with knowledge of the matter, reported on Thursday that Flynn had sought immunity from the Federal Bureau of Investigation and the House and Senate intelligence panels in exchange for his testimony. The newspaper said he had so far found no takers.

The House of Representatives panel denied the Journal report. “Michael Flynn has not offered to testify to HPSCI in exchange for immunity,” committee spokesman Jack Langer said in a statement.

The FBI declined to comment. The Senate committee did not immediately respond to a request for comment.

Flynn was fired in February as national security adviser for failing to disclose talks with Russia’s ambassador about U.S. sanctions on Moscow. The talks occurred before Trump took office in January.

Flynn’s lawyer, Robert Kelner, confirmed in a statement that his client had held discussions with the House and Senate intelligence committees. His statement did not mention the FBI.

He said Flynn “is now the target of unsubstantiated public demands by Members of Congress and other political critics that he be criminally investigated.”

Kelner said Flynn would not “submit to questioning in such a highly politicized, witch hunt environment without assurances against unfair prosecution.”

The FBI and the House and Senate intelligence committees are investigating allegations that Russians hacked Democratic Party computers and publicly disclosed the information in a bid to tip the November presidential election in favor of Trump, whose views were seen as more in line with the Moscow’s.

They are also looking into possible ties between the Trump campaign and Russians.

Independent Senator Angus King, a member of the Senate Intelligence Committee, told CNN he could not confirm the Journal report, but “if that turns out to be the case, that’s a significant development I believe because it indicates that he has something important to say.”