United States Department Of Homeland Security

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In this June 5, 2015, photo, the Homeland Security Department headquarters in northwest Washington, D.C., is shown. (AP Photo/Susan Walsh) **FILE**

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A gate leading to the Homeland Security Department headquarters in northwest Washington is seen here on June 5, 2015. (Associated Press) **FILE**

Homeland Security Department Inspector General John Roth, Department of Homeland Security, testifies on Capitol Hill in Washington, Tuesday, June 9, 2015, before the Senate Homeland Security and Governmental Affairs Committee's oversight hearing to examine the Transportation Security Administration's (TSA) challenges. (AP Photo/Cliff Owen)

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Senate Judiciary Committee member Sen Richard Durbin, D-Ill. questions Homeland Security Secretary Jeh Johnson, on Capitol Hill in Washington, Tuesday, April 28, 2015, during the committee's hearing on oversight of the Homeland Security Department. (AP Photo/Lauren Victoria Burke) **FILE**

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FILE - In this Feb. 25, 2015 file photo, the Homeland Security Department headquarters in northwest Washington, Tuesday, Feb. 24, 2015. on Wednesday, President Barack Obama signed a law funding the Homeland Security Department through the end of the budget year. (AP Photo/Manuel Balce Ceneta, File)

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lead inL House Speaker John Boehner of Ohio leaves the House chamber on Capitol Hill in Washington, Friday, Feb. 27, 2015, after the House voted to go to conference committee on a long-term "clean" spending bill for the Homeland Security Department hours before a shutdown was to begin. (AP Photo/J. Scott Applewhite) (credit)

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House Speaker John A. Boehner told fellow Republicans in a closed-door meeting that keeping the Homeland Security Department open with a three-week funding bill would strengthen their bargaining position, according to lawmakers in attendance. (Associated Press photographs)

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House Minority Leader Nancy Pelosi of Calif., accompanied by House Democrats, calls on their GOP colleagues to pass a funding bill for the Homeland Security Department that does not contain provisions aimed at blocking President Barack Obama's executive actions on immigration, Friday, Feb. 13, 2015, on Capitol Hill in Washington5. (AP Photo/J. Scott Applewhite)

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The Homeland Security Department is experimenting with GPS-enabled ankle bracelets to track illegal immigrants in the U.S. (Associated Press)

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FILE -, In this July 25, 2013 file photo, Alejandro Mayorkas, President Obama's then-nominee to become deputy secretary of the Homeland Security Department, testifies on Capitol Hill in Washington. The Homeland Security Department has ordered agents at airports and other ports of entry to observe everyone coming into the United States for potential signs of Ebola infection, officials said Wednesday. Mayorkas said Customs and Border Protection agents are also handing out factsheets to travelers with details of what symptoms to look for and directions to call a doctor if they become sick within 21 days. (AP Photo/J. Scott Applewhite, File)

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Federal Protective Service Director Eric Patterson, Homeland Security Department, walks on Capitol Hill in Washington, Wednesday, May 21, 2014, after testifying before the House Economic Development, Public Buildings, and Emergency Management hearing examining the Federal Protective Service. (AP Photo/Lauren Victoria Burke)

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The Homeland Security Department's inspector general is investigating the program and the former director of USCIS, Alejandro Mayorkas, whom President Obama has since promoted to be deputy secretary of Homeland Security.