The influential House conservative caucus ousted its top staffer Wednesday amid allegations that he undermined the policy position of some GOP lawmakers, the latest shot fired in the ongoing battle between congressional Republicans and a constellation of outside groups.

Rep. Steve Scalise (R-La.), chairman of the Republican Study Committee, told reporters that he fired the caucus’s top aide, saying he no longer had the “trust” of lawmakers. “We all rely on staff but we have to have the full trust of our staff, unfortunately that’s no longer the case,” Scalise said while exiting the weekly huddle of the caucus in the Capitol basement.