Roger Wayne Marshall (born August 9, 1960) is an American politician, physician, and former military officer serving as the junior United States senator from Kansas since 2021. A member of the Republican Party, he served from 2017 to 2021 as the U.S. representative for Kansas's 1st congressional district, a mostly rural district covering much of the western and northern parts of the state. An obstetrician, Marshall was first elected to Congress in 2016, defeating incumbent Tim Huelskamp in the Republican primary for Kansas's 1st congressional district. On September 7, 2019, he announced his bid for the United States Senate in the 2020 election; he sought the seat being vacated by Pat Roberts. Marshall won the August 4 Republican primary and was elected on November 3, defeating Democratic nominee Barbara Bollier. Marshall was sworn in on January 3, 2021. On January 6, 2021, Marshall joined a group of Republican senators led by Josh Hawley and Ted Cruz in support of the objections to Pennsylvania's and Arizona's electoral votes, both of which were overwhelmingly rejected by the Senate, 92-7 and 93-6 respectively.