Question: On January 30, 2017, Elaine Duke was nominated by President Donald Trump to become the United States Deputy Secretary of Homeland Security under a man born in which year ?
Related documents: [0]  [DOC] John Francis Kelly (born May 11, 1950) is the current White House Chief of Staff for U.S. President Donald Trump, previously serving as U.S. Secretary of Homeland Security in the same administration. [END] 
[1]  [DOC] Elaine Costanzo Duke (born 1958) is an American civil servant who is the current Acting United States Secretary of Homeland Security. On January 30, 2017, she was nominated by President Donald Trump to become the United States Deputy Secretary of Homeland Security under John F. Kelly. She became acting Secretary of Homeland Security on July 31, 2017, when John F. Kelly assumed the office of White House Chief of Staff. [END] 
Answer: 
1950
1950