The Wall Street Journal reports that the wall of silence around Donald Trump and his Russian connections is starting to crack.

But so far, nobody is taking Flynn up on his offer — an interesting point that may mean they don’t even need his testimony.

WASHINGTON—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.

He has made the offer to the FBI and the House and Senate intelligence committees though his lawyer but has so far found no takers, the officials said.