Iranian President Mahmoud Ahmadinejad during his address today at the U.N. John Moore/Getty Images hide caption

itoggle caption John Moore/Getty Images

Dan Senor, senior national security aide to Mitt Romney, speaks to the press en route to Israel from London on Saturday. Jason Reed/Reuters /Landov hide caption

itoggle caption Jason Reed/Reuters /Landov

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

itoggle caption BGNES.com