FILE - In this Jan. 30, 2018 file photo, Wisconsin Republican senate candidate Kevin Nicholson speaks with reporters in Madison, Wis. U.S. Sen. Tammy Duckworth, of Illinois, and other Democratic veterans sent a letter Wednesday, May 9, 2018, to Nicholson calling for him to apologize for questioning the "cognitive thought process" of veterans who are Democrats. Nicholson is a Marine veteran and he remains steadfast in refusing to apologize. (AP Photo/Scott Bauer, File)
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