Kash Patel suggested those calling him dangerous for a role in President-elect Donald Trump’s Cabinet should show “proof” of their claims, calling out former FBI Deputy Director Andrew McCabe specifically.

McCabe’s recent comments against Patel, claiming that “no part of the FBI’s mission” would be “safe” with Patel in a leadership role, come as the former Department of Defense chief of staff is rumored to be in Trump’s consideration for FBI director. In response to McCabe, Patel pointed to his 16-plus years in government service” to rebut such claims, contending that he was only beholden to the U.S. Constitution.