Peter James Roskam /ˈrɒskəm/ is a former U.S. Representative for Illinois's 6th congressional district, serving five terms from 2007 to 2019. He is a member of the Republican Party and served as the Chief Deputy Majority Whip from 2011–14, ranking fourth among House Republican leaders. Previously, he served in the Illinois Senate and the Illinois House of Representatives. He served as Chairman of the House Ways and Means Subcommittee on Tax Policy for the 115th Congress. Roskam was defeated by Democratic challenger Sean Casten in the 2018 election.