(L-R) U.S. Senator John McCain, (R-AZ) U.S. Republican presidential candidate Senator Lindsey Graham (R-SC) and former U.S. Senator Joe Lieberman attend a campaign event in New York July 20, 2015. Speaking at a town hall event in New York City, Senator Graham called on members of congress to vote against the Iran nuclear deal negotiated by the Obama administration. Flanked by Senator John McCain (R-AZ) and former Senator Joseph Lieberman, Graham said the deal would unleash a nuclear arms race in the Middle East. REUTERS/Brendan McDermid