Lindsey Graham

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Republican U.S. Senate candidate Bill Connor 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)

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Republican U.S. Senate candidate Richard Cash 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)

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Republican U.S. Senate candidate Lee Bright 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)

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FILE - In this March 18, 2013 file photo, U.S. Sen. Lindsey Graham meets with reporters in Charleston, S.C. Graham's campaign announced on Friday, Jan. 31, 2014 that the candidate has $7.6 million in campaign funds in the bank while fellow Republican U.S. Sen. Tim Scott has $3.1 million for next fall's campaign, giving them a formidable money advantage over their opponents. (AP Photo/Bruce Smith, File)