In this Sept. 5, 2018, photo, Sen. Jon Kyl, R-Ariz., waits to be sworn in as a U.S. Senator by Vice President Mike Pence in at the Old Senate Chamber on Capitol Hill in Washington. Arizona Gov. Doug Ducey announced Friday, Dec. 14, Kyl will resign at the end of the year from the U.S. Senate seat he was appointed to less than four months ago following the death of Sen. Jon McCain. (AP Photo/Cliff Owen, File)