Transgender women could be banned from using female bathrooms inside the Capitol building under a resolution being introduced by Rep. Nancy Mace (R-SC) on Monday. 

Under the bill, which Mace is hoping to attach to the new House rules package that will be voted on next year, the House sergeant-at-arms would be required to enforce the new rule. The legislation comes as the House is set to welcome its first transgender lawmaker on Jan. 3 with the swearing-in of Rep.-elect Sarah McBride (D-DE).