Republican presidential candidate Mitt Romney meets Israeli Prime Minister Benjamin Netanyahu before a meeting at the prime minister's office Sunday in Jerusalem, Israel. Uriel Sinai/Getty Images hide caption

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A screen grab from the surveillance video showing the man who it's suspected set off a bomb aboard a bus full of Israeli tourists in Burgas, Bulgaria. BGNES.com hide caption

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Bedouins watch flames rise in July 2011 after masked gunmen blew up a terminal of the Egyptian natural gas pipeline to Israel and Jordan. It was one of many attacks on the pipeline since the popular uprising that ousted longtime Egyptian leader Hosni Mubarak last year. AP hide caption

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Israeli Prime Minister Benjamin Netanyahu looked on as President Obama spoke this morning in the Oval Office of the White House. Saul Loeb /AFP/Getty Images hide caption

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President Obama on Tuesday during a speech at the United Auto Workers' National Community Action Program Legislative Conference in Washington, D.C. Chip Somodevilla/Getty Images hide caption

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Iran's Supreme Leader Ayatollah Ali Khamenei in 2009. Behrouz Mehri /AFP/Getty Images hide caption

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