Lisa Gordon-Hagerty, the administrator of the National Nuclear Security Administration, resigned Friday.

The NNSA oversees the work at the Y-12 National Security Complex in Oak Ridge and other nuclear weapons sites across the nation. The NNSA, which is part of the U.S. Department of Energy, maintains nuclear warheads, produces fuel for the nuclear navy, and works on nuclear nonproliferation, among other activities.

Gordon-Hagerty, who was also under secretary of energy for nuclear security, became the first woman to lead the NNSA in February 2018.

It’s not clear why she resigned Friday or whether her resignation was voluntary.

Defense News reported that the resignation was driven by almost a year of clashes between Gordon-Hagerty’s office and Energy Secretary Dan Brouillette, including over budgets.

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