As part of his guilty plea, President Trump's former national security adviser Michael Flynn assisted special counsel Robert Mueller in his investigations into the Trump campaign's discussions of WikiLeaks, as well as "potential efforts to interfere or otherwise obstruct" the special counsel, according to a new court filing.

Details: The filing, which states that Flynn is ready for sentencing, claims that the former top Trump aide informed prosecutors of multiple instances in which "either he or his lawyers received communications from persons connected to the Administration or Congress that could have affected both his willingness to cooperate and the completeness of that cooperation." The filing also states that Flynn "provided a voicemail recording of one such communication."

On the WikiLeaks front, Flynn gave prosecutors statements made in 2016 by Trump campaign officials after the release of the Podesta emails in which "the prospect of reaching out to WikiLeaks was discussed."

Why it matters: This filing suggests Flynn was a far more valuable witness to Mueller than previously known.

Read the full court filing: