FILE - In this June 10, 2015, file photo, Coast Guard Vice Commandant Peter Neffenger testifies on Capitol Hill in Washington, before the Senate Homeland Security Committee hearing on his nomination to head the Transportation Security Administration (TSA). (AP Photo/Jacquelyn Martin, File)
United States Secret Service director Julia Pierson speaks with reporters as Senate Homeland Security Committee Chairman Tom Carper, D-Del., listens after they departed a committee hearing on recent Secret Service agents behavior, on Capitol Hill in Washington, Tuesday, April 1, 2014. (AP Photo/Cliff Owen)
Sen. Lindsey Graham, R-S.C., a member of the Senate Armed Services Committee and the Senate Homeland Security Committee, center, accompanied by fellow Senate Armed Services Committee member, Sen. Kelly Ayotte, R-N.H.,, right, gestures while speaking to reporters on Capitol Hill in Washington, Tuesday, Nov. 27, 2012, after a closed-door meeting with UN Ambassador Susan Rice. (AP Photo/J. Scott Applewhite)
Sen. Joe Lieberman, chairman of the Senate Homeland Security committee, believes Iranian special forces were behind a series of sophisticated foreign cyberattacks against the websites of U.S. banks. (Associated Press)
** FILE ** Sen. Susan Collins, R-Maine, the ranking member of the Senate Homeland Security Committee, right, accompanied by the committee's Chairman Sen. Joseph Lieberman, I-Conn., gestures during a news conference on Capitol Hill in Washington, Tuesday, July 24, 2012. (AP Photo/J. Scott Applewhite)
"I'd say it's a reasonable question and that the White House ought to be conducting its own internal investigation of White House personnel who were in Cartagena, just to make sure that none of them were involved in this kind of inappropriate behavior," said Sen. Joe Lieberman, chairman of the Senate Homeland Security Committee. (Associated Press/CBS News)