Michael Flynn, the former Trump administration national security adviser, on Monday bolstered his criminal defense legal team in Washington, where he is awaiting sentencing after pleading guilty to lying to the FBI amid the special counsel’s investigation of Russia’s interference in the 2016 presidential election.

Flynn recently fired his Covington & Burling defense lawyers and hired Dallas-based attorney Sidney Powell, a former federal prosecutor and conservative commentator who has assailed the special counsel’s prosecution team.