Tom Coburn

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Rep. James Lankford won the Republican nomination race to replace retiring Sen. Tom Coburn of Oklahoma. (AP Photo/J. Scott Applewhite, File)

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FILE - In this Dec. 19, 2013 file photo, Sen. Tom Coburn, R-Okla., left, walks with Sen. Richard Burr, R-N.C., on the way to a procedural vote on a comprehensive defense bill as the Senate’s legislative year nears to a close, at the Capitol in Washington. Coburn's announcement late last week that he will forego his final two years in office means Oklahoma will not only have two US Senate races this year, it is expected to trigger a series of dominoes on the GOP side as politicians on the Sooner State's deep Republican bench mull a run. (AP Photo/J. Scott Applewhite, File)

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FILE - In this Dec. 17, 2013 file photo, Sen. Tom Coburn, R-Okla., a longtime deficit hawk, outlines his annual “Wastebook,” which points a critical finger at billions of dollars in questionable government spending during a news conference on Capitol Hill in Washington. U.S. Sen. Tom Coburn says he plans to finish the current year in office and resign his seat nearly two years before his term is scheduled to end. The 66-year-old Coburn released a statement late Thursday, Jan. 16, 2014 saying he would give up his seat at the end of the current session of Congress, scheduled to end in January 2015.(AP Photo/J. Scott Applewhite, File)

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In this Dec. 17, 2013 file photo, Sen. Tom Coburn, R-Okla., a longtime deficit hawk, outlines his annual "Wastebook" which points a critical finger at billions of dollars in questionable government spending during a news conference on Capitol Hill in Washington. On March 28, 2020, Mr. Coburn's family released a statement noting the former senator has passed away. (AP Photo/J. Scott Applewhite, File)

Associated Press Sen. Tom Coburn

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Sen. Tom Coburn, R-Okla., left, walks with Sen. Richard Burr, R-N.C., on the way to a procedural vote on a comprehensive defense bill as the Senate's legislative year nears to a close, at the Capitol in Washington, Thursday, Dec. 19, 2013. (AP Photo/J. Scott Applewhite)

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National Edition News cover for December 18, 2013 - ‘Wastebook’ targets 70 days in bed, Facebook: While the Senate debates the bipartisan budget plan, Sen. Tom Coburn, R-Okla., a longtime deficit hawk, outlines his annual "Wastebook" which points a critical finger at billions of dollars in questionable government spending, Tuesday, Dec. 17, 2013, during a news conference on Capitol Hill in Washington. (AP Photo/J. Scott Applewhite)

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Sen. Tom Coburn found $325,000 of taxpayer money went to the National Institutes of Health for research that concluded "wives should calm down." (ASSOCIATED PRESS)