The Deputy Secretary of State of the United States is the chief assistant to the Secretary of State. If the Secretary of State resigns or dies, the Deputy Secretary of State becomes Acting Secretary of State until the President nominates and the Senate confirms a replacement. The position was created in 1972. Prior to July 13, 1972, the Under Secretary of State had been the second ranking officer of the Department of State. The current Deputy Secretary of State is Tony Blinken, who was formerly the Deputy National Security Adviser for Barack Obama.