Retired Lt. Gen. Dan “Razin” Caine, President Donald Trump’s choice to be the next chairman of the Joint Chiefs of Staff, is set to appear in front of the Senate Armed Services Committee on Tuesday for his confirmation hearing.

Caine retired last year as a three-star lieutenant general from the Air Force. His last assignment was as associate director for military affairs at the CIA. He was an unconventional pick to be the president’s top military adviser, partly because he didn’t meet the legal requirements for the role and thus required a presidential waiver and had already retired.