**FILE** Secretary of Homeland Security Janet Napolitano
FILE - In this April 25, 2012 file photo, Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington. Expanding the prostitution investigation, the Secret Service acknowledges it is checking whether its employees consorted with strippers and prostitutes in advance of President Barack Obama's visit last year to El Salvador. The disclosure comes not long after the Homeland Security secretary assured skeptical senators that the prostitution scandal in Colombia appeared to be an isolated incident. (AP Photo/Susan Walsh, File)
** FILE ** In this April 25, 2012, file photo, Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington before the Senate Judiciary Committee hearing on the Secret Service prostitution scandal. (AP Photo/Susan Walsh, File)
** FILE ** In this April 25, 2012, file photo, Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington before the Senate Judiciary Committee hearing on the Secret Service prostitution scandal. (AP Photo/Susan Walsh, File)
FILE - In this April 25, 2012 file photo, Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington. Expanding the prostitution investigation, the Secret Service acknowledges it is checking whether its employees consorted with strippers and prostitutes in advance of President Barack Obama's visit last year to El Salvador. The disclosure comes not long after the Homeland Security secretary assured skeptical senators that the prostitution scandal in Colombia appeared to be an isolated incident. (AP Photo/Susan Walsh, File)
Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington on Wednesday, April 25, 2012, before the Senate Judiciary Committee hearing on the Secret Service prostitution scandal that has embarrassed the White House and overshadowed the president's visit to a Latin American summit. (AP Photo/Susan Walsh)
Homeland Security Secretary Janet Napolitano arrives on Capitol Hill in Washington, Wednesday, April 25, 2012, to testify before the Senate Judiciary Committee hearing on the Secret Service prostitution scandal that embarrassed the White House and overshadowed the president's visit to a Latin American summit. (AP Photo/Susan Walsh)
Homeland Security Secretary Janet Napolitano testifies on Capitol Hill in Washington on Wednesday, April 25, 2012, before the Senate Judiciary Committee hearing on the Secret Service prostitution scandal that has embarrassed the White House and overshadowed the president's visit to a Latin American summit. (AP Photo/Susan Walsh)
Homeland Security Secretary Janet Napolitano, accompanied by Transportation Security Administration chief John Pistole, announces the expansion of a passenger pre-screening initiative on Feb. 8, 2012, at Washington's Ronald Reagan National Airport. (Associated Press)
