Former Arizona Sen. Jon Kyl has agreed to serve as the “lead sherpa” for the confirmation effort for President Donald Trump’s forthcoming U.S. Supreme Court nominee, according to White House spokesman Raj Shah.

Kyl retired from the U.S. Senate in 2013 as the second-highest ranking Republican senator. He has deep knowledge of the Senate Judiciary Committee, having served on the committee during four of the last five Supreme Court justices’ confirmation hearings.