Committee Chairman Rep. Jason Chaffetz, R-Utah, listens to testimony during a House Oversight and Government Reform Committee hearing on May 17. Last year, dozens of Secret Service employees improperly accessed files on Chaffetz. Drew Angerer/Getty Images hide caption

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Drew Angerer/Getty Images

Passengers wait in line to be screened at a Transportation Security Administration checkpoint at Chicago's O'Hare International Airport on Monday. Scott Olson/Getty Images hide caption

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Scott Olson/Getty Images

Department of Homeland Security Secretary Jeh Johnson. Yuri Gripas/Reuters /Landov hide caption

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Yuri Gripas/Reuters /Landov

Jeh Johnson on 'Morning Edition'

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President Obama stands with Jeh Johnson, his choice for the next Homeland Security secretary, and Vice President Joe Biden, in the White House Rose Garden on Friday. Charles Dharapak/AP hide caption

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Charles Dharapak/AP