Flags from nations around the world fly outside the U.N. building in New York City. The challenges facing President Obama's foreign policy team will be among the topics of today's national conversation, hosted by Talk of the Nation and the Wilson Center. Stan Honda /AFP/Getty Images hide caption

itoggle caption Stan Honda /AFP/Getty Images

President Obama and GOP presidential nominee Mitt Romney walk away after they greet each other at the end of the third presidential debate in Boca Raton, Fla., on Monday. Saul Loeb/AFP/Getty Images hide caption

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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