First lady Melania Trump enters the room prior to United States President Donald J. Trump announcing he will name Principal Deputy White House Chief of Staff Kirstjen Nielsen as Secretary of Homeland Security in the East Room of the White House in Washington, DC on Thursday, October 12, 2017.  If confirmed, Nielsen will replace Acting US Secretary of Homeland Security Elaine C. Duke, who has been in that position since General John F. Kelly, USMC (Retired) resigned to become White House Chief of Staff.<br /> Credit: Ron Sachs / CNP /MediaPunch