The United Nations Security Council selected former Portuguese Prime Minister Antonio Guterres to be the new secretary-general. Guterres, 67, will succeed Ban Ki-moon. Samantha Power, the U.S. ambassador to the UN, tweeted Wednesday morning that the Security Council is “united” behind Guterres. He served as prime minister from 1995 to 2002, and most recently was the UN high commissioner for refugees, a position he held from 2005 until 2015. He was a member of the Socialist Party in Portugal.