Caine, a three-star general whom Trump has praised since at least 2019, helped lead an operation in Iraq against the Islamic State during Trump’s first term.

President Donald Trump’s choice to be the top U.S. military officer, retired Air Force Lt. Gen. Dan Caine, endeared himself to the commander in chief through his military call sign, “Razin,” during a meeting in Iraq years ago.

President Trump has picked retired Air Force Lt. Gen. Dan Caine to serve as the next chairman of the Joint Chiefs of Staff. NBC News' Courtney Kube has details on Trump and Caine's past and the possible complications of getting him confirmed to the position.