Michael Flynn, the former Trump administration national security adviser who pleaded guilty to making false statements in a case brought by the special counsel, has retained special counsel critic Sidney Powell, a former federal prosecutor, as his new lawyer.

Flynn’s previous defense team at Covington & Burling withdrew last week, saying Flynn had terminated their service. Court filings in Washington did not give a reason. Flynn’s defense had been led by Covington partner Robert Kelner, who chairs the firm’s election and political law practice group.