The attorney for Lev Parnas, the ex-Rudy Giuliani associate now charged with federal campaign-finance violations, told Law.com affiliate the New York Law Journal on Thursday his client wants to tell his story to Congress in an effort, partly, to mitigate any sentence he might receive in federal court.

Joseph Bondy, Parnas’ Manhattan-based criminal defense counsel, said his client and federal prosecutors are at an impasse, after earlier attempts to provide information to the Manhattan U.S. Attorney’s Office were rebuffed.