Jeff Roe, a top strategist for the main super PAC supporting Ron DeSantis’ presidential campaign, announced his resignation from the group late Saturday — the latest in a string of departures from the organization.

The pro-DeSantis group, Never Back Down, has been enveloped in turmoil in recent weeks. Two weeks ago, it fired three of its top officials, including the super PAC’s chief executive officer. The board chairman, former Nevada Attorney General Adam Laxalt, also left, as did the organization’s president, Chris Jankowski.

Republican strategist Phil Cox, a longtime DeSantis ally and adviser, has stepped in to help steer the PAC in the final weeks before the Iowa caucus.