NPR's Leila Fadel speaks with Stephen Rapp, a former U.S. ambassador-at-large for war crimes issues, on his trip to Syria to help preserve evidence from mass graves.

Federal government faces shutdown after stop-gap funding bill fails in the House, fighting rages in eastern Ukrainian city of Pokrovsk, Syria forming a new government after fall of Assad regime.

Syria's new rulers are forming a government after more than half a century of dictatorship under former leader Bashar al-Assad and his father.

Greenfield, the outgoing U.S. ambassador to the U.N., about her career in foreign service and American diplomacy.