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(NewsNation) — Republican Rep. Nancy Mace plans to introduce a resolution requiring all individuals in the Capitol complex to use bathrooms matching their gender assigned at birth, a move that could spark controversy as the first openly transgender House member prepares to take office.

Mace is currently working with House leadership to include the bathroom restrictions into a rules package, sources familiar with the matter say. If unsuccessful, she intends to pursue “a privileged motion,” which would allow her to bypass standard procedural requirements.

The timing of the proposed resolution coincides with Democrat Sarah McBride‘s upcoming swearing-in this January. McBride made history in November as the first openly transgender person elected to the U.S. House of Representatives.

“Never thought this would have to happen, but we are introducing a resolution banning biological men from entering protected spaces for women on Capitol grounds. Protecting biological women starts here and it starts now,” Mace wrote in a post on X.