Lindsey Graham

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** FILE ** Sen. Lindsey Graham speaks during a campaign stop at American Legion Post 20 on Wednesday, April 23, 2014, in Greenwood, S.C. (AP Photo/Rainier Ehrhardt)

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Sen. Lindsey Graham speaks during a campaign stop at American Legion Post 20 on Wednesday, April 23, 2014, in Greenwood, S.C. (AP Photo/Rainier Ehrhardt)

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In this Sept. 3, 2013, file photo Sen. Lindsey Graham, R-S.C., talks to a reporter following a speech in Goose Creek, S.C. (AP Photo/Bruce Smith, File)

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Sens. Kelly Ayotte, John McCain and Lindsey Graham say breathing new life into the Bush-era missile defense system — particularly by pursuing a "third site" in the Czech Republic — would be an effective way to punish Russian President Vladimir Putin for his use of military force to effect a swift annexation of Ukraine's Crimean Peninsula. (Associated Press)

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U.S. Sen. Lindsey Graham gives a check to the South Carolina election commission as he files to run for re-election on Wednesday, March 19, 2014, in Columbia, S.C. Graham is seeking a third tern, (AP Photo/Jeffrey Collins)

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Republican U.S. Senate candidate Richard Cash, center, signs an agreement to support any challenger who gets into a runoff with U.S. Sen. Lindsey Graham in June as he stands on the steps of the Statehouse, Thursday, March 13, 2014, in Columbia, S.C. Six GOP candidates have said they want to take on Graham as he seeks a third term. (AP Photo/Jeffrey Collins)

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Republican U.S. Senate candidate Dave Feliciano speaks after signing an agreement to support any challenger who gets into a runoff with U.S. Sen. Lindsey Graham in June, on the steps of the Statehouse Thursday, March 13, 2014, in Columbia, S.C. Six GOP candidates have said they want to take on Graham as he seeks a third term. (AP Photo/Jeffrey Collins)