Lindsey Graham

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Possible 2016 presidential candidate U.S. Sen. Lindsey Graham, R-S.C., speaks at the Republican Leadership Summit Saturday, April 18, 2015, in Nashua, N.H. (AP Photo/Jim Cole)

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Sen. Lindsey Graham, R-S.C., speaks in Nashua, N.H., in this April 18, 2015, file photo. (AP Photo/Jim Cole, File)

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FILE - In this April 18, 2015 file photo, Sen. Lindsey Graham, R-S.C., speaks in Nashua, N.H. Senate proponents of a bill empowering Congress to review and potentially reject any Iran nuclear deal must first win a battle with some colleagues determined to change the legislation in ways that could sink it. "Anybody who monkeys with this bill is going to run into a buzz saw," Republican Sen. Lindsey Graham of South Carolina warned ahead of last week's debate and this week's vote. (AP Photo/Jim Cole, File)

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Sen. Lindsey Graham of South Carolina said there is a better than 90 percent chance that he will seek the Republican presidential nomination next year but that he needs to get a campaign apparatus in place. (Associated Press)

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Sen., Lindsey Graham, R-S.C., talks to employees after touring New Hampshire Ball Bearings Thursday April 9, 2015 in Laconia, N.H. Lindsey met with workers to discuss their support of legislation re-authorizing the Export-Import Bank. (AP Photo/Jim Cole)

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Keynote speaker U.S. Sen. Lindsey Graham of South Carolina takes questions after speaking at the political speech series “Politics & Eggs” in Bedford, N.H., Monday, March 9, 2015. U.S. Sen. Lindsey Graham is the latest Republican to visit New Hampshire to explore a presidential run. (AP Photo/Cheryl Senter)

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Senator Lindsey Graham, R-S.C., speaks at the American Israel Public Affairs Committee (AIPAC) Policy Conference in Washington, Sunday, March 1, 2015. (AP Photo/Cliff Owen)

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Sen. Lindsey Graham, R-S.C., speaks on Capitol Hill in Washington, in this Jan. 28, 2015, file photo. (AP Photo/Susan Walsh, File)

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Sen. Lindsey Graham, South Carolina Republican and an outspoken critic of Mr. Obama's foreign policy, said additional sanctions would reinforce rather than undermine the U.S. bargaining position with Iran. (Associated Press)

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Sen. Lindsey Graham, South Carolina Republican, talks with reporters after the Senate voted on a $1.1 trillion spending bill to fund the government through the next fiscal year on Saturday, Dec. 13, 2014 on Capitol Hill in Washington. (AP Photo/Lauren Victoria Burke) ** FILE **

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Sen. Lindsey Graham, said a report on the Benghazi attack released late last week is "full of crap." (AP Photo/Rainier Ehrhardt)

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The Republican takeover of the Senate may pave the way for Sen. John McCain (left) and other GOP foreign policy hawks like Sen. Lindsey Graham to try to play "back-seat driver" to the White House, but at the end of the day, "if the president doesn't want to do what they push for, that's entirely up to him," said one senior congressional aide. (Associated Press)

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Sens. John McCain (left) and Marco Rubio (right), and Sen. Lindsey Graham — who all collaborated with Mr. Obama and Democrats last year to pass a broad legalization bill in the Senate — said in a letter that the president lacks the legal authority to act on his own. (Associated Press)

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Sen. Lindsey Graham said Sunday that the decision to withdraw U.S. forces from Iraq has made the chances for another 9/11-like attack on American soil "inevitable." (CBS News)

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Sen. Lindsey Graham, R-Seneca, speaks Friday, May 30, 2014, during a town hall-style debate of candidates for U.S. Senate. Graham, and challengers Bill Connor, Det Bowers, Lee Bright, Jay Stamper, Richard Cash and Nancy Mace participated in the debate at the historic Booker T. Washington auditorium on The USC campus in Columbia.(AP Photo/The State, Tracy Glantz)