Two lawmakers claimed Tuesday that the U.S. Secret Service may need to seek outside help to fulfill its mission because agents are leaving the agency faster than they can be replaced.

"USSS simply cannot hire enough personnel to keep pace with historic attrition rates," House Oversight and Government Reform Committee chairman Jason Chaffetz, R-Utah, and ranking Democrat Elijah Cummings of Maryland noted in a Tuesday letter to Secret Service director Joseph Clancy.

"The committee encourages USSS to explore innovative ways to fill this staffing gap-such as detailing qualified law enforcement officials or [administrative, professional, and technical] employees from other agencies-in the short-term while continuing its long-term efforts to develop a zero-based budget and increase hiring and retention," they wrote.

Their letter comes on the heels of a DHS probe that raised questions about the agency's "ability to protect the White House and its occupants." The inquiry was launched after a man succeeded in jumping a fence and entering the White House in 2014.

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