FILE - In this Feb. 1, 2020 file photo, former Kansas Secretary of State Kris Kobach, a candidate for the U.S. Senate, answers a question during a debate in Olathe, Kan. Establishment Republicans who'd been coy for months about the GOP primary for Kansas' open Senate seat are increasingly putting their thumbs on the scale. They're hoping to push western Kansas Rep. Roger Marshall to victory over polarizing conservative Kris Kobach. (AP Photo/John Hanna, File)

Sen. Pat Roberts, R-Kan., listens during a Senate Health, Education, Labor and Pensions Committee hearing, Tuesday, June 23, 2020 on Capitol Hill in Washington, to discuss the lessons learned during the coronavirus. (Greg Nash/Pool via AP)

FILE - In this Feb. 1, 2020 file photo, U.S. Rep. Roger Marshall, R-Kan., a candidate for the U.S. Senate, awaits the start of a debate in Olathe, Kansas, Establishment Republicans who'd been coy for months about the GOP primary for Kansas' open Senate seat are increasingly putting their thumbs on the scale. They're hoping to push western Kansas Rep. Roger Marshall to victory over polarizing conservative Kris Kobach. (AP Photo/John Hanna, File)