More than three dozen lawmakers are already planning to leave Congress next year. But there’s another impending legislative branch retirement that could have major implications in Washington.

Comptroller General Gene Dodaro, who heads the Government Accountability Office, hits the end of his 15-year term Dec. 22 and will be forced to vacate the post that occupies an increasingly crucial — and politically charged — oversight role.

The comptroller general is uniquely empowered to call out the president for breaking the law by withholding federal cash, and Dodaro has done so repeatedly over the past eight months — putting himself at the center of…

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