Former National Security Adviser Michael Flynn tells the FBI as well as the House and Senate Intelligence Committees he’s willing to testify against President Trump’s alleged ties to Russia in exchange for immunity, according to the Wall Street Journal.

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Flynn was Trump’s adviser for a mere 24 days before being forced to resign after it became public he’d spoken with Russian ambassador Sergey Kislyak before the inauguration. It was reported that he misled White House staff members and lied directly to the Vice President about having any communication with Russia.

If he is granted immunity, he could become a pivotal piece in the FBI’s investigation into whether Trump and his campaign members colluded with Russia during the 2016 election.

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In the midst of the 2016 election, it was announced that Flynn had received thousands of dollars from three Russian companies.

Others this week announced they would voluntarily speak to the House Intelligence Committee as they probe Russian interference in the election. Trump’s former campaign chairman Paul Manafort, whose links to Russia have been under increasing scrutiny, said he would be interviewed.

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Trump’s son-in-law, Jared Kushner, has volunteered to be interviewed also. Neither of these men were offered or requested any kind of immunity deal.

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Flynn had access to sensitive material on foreign matters during the transitional period of Trump’s presidency. He refused to speak to the FBI or anyone involved in the search after he resigned.

If Flynn has been threatened with legality proceedings, it might explain why he could be pressured into talking.

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Trump, who is adamant that he has no ties to Russia, said shortly after Flynn was forced to resign that he never told him to speak to Kislyak, but he would have encouraged it.

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The White House confirmed in March that in addition to Flynn speaking to Kislyak over the phone, the two also met in Trump Tower in December. If Flynn does agree to take the deal with immunity he could shake up a presidency that has barely gotten off the ground.