Addison Mitchell "Mitch" McConnell, Jr. (born February 20, 1942) is the senior United States Senator from Kentucky. A member of the Republican Party, he has been the Majority Leader of the Senate since January 3, 2015. He is the 15th Senate Republican Leader and the second Kentuckian to lead his party in the Senate. He is also the longest-serving U.S. senator in Kentucky history.