From the Wall Street Journal:
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.
As an adviser to Mr. Trump’s presidential campaign, and later one of Mr. Trump’s top aides in the White House, Mr. Flynn was privy to some of the most sensitive foreign-policy deliberations of the new administration and was directly involved in discussions about the possible lifting of sanctions on Russia imposed by the Obama administration.
You might recall that back in September, Flynn told NBC (referring to Hillary Clinton), "When you are given immunity, that means you have probably committed a crime." See below at the :52 mark.
The great irony here is that Flynn led chants of "Lock her up!" at last summer's Republican National Convention, and now he's asking for immunity to stay out of jail himself.
See the statement below from Flynn's counsel asserting that Flynn "wants to tell" his side of the story.