James Paul Lankford is an American politician serving as the senior United States senator from Oklahoma. A member of the Republican Party, Lankford has represented Oklahoma in the U.S. Senate since 2015. Before his Senate service, he represented Oklahoma's 5th congressional district in the U.S. House of Representatives from 2011 to 2015.

Oklahoma's 5th congressional district is a congressional district in the U.S. state of Oklahoma. It borders all of the other congressional districts in the state except the 1st district. It is densely populated and covers most of Oklahoma County and all of Lincoln, Pottawatomie and Seminole counties, as well as parts of Canadian and Logan counties. With a Cook Partisan Voting Index rating of R+12, it is the least Republican district in Oklahoma, a state with an all-Republican congressional delegation.