A sitting congresswoman is pushing to get the incoming, first-ever openly transgender member of Congress barred from using women’s bathrooms at the U.S. Capitol.

Republican Rep. Nancy Mace introduced legislation to ban trans women from using single-sex bathrooms on Capitol Hill, targeting Rep.-elect Sarah McBride, the first openly trans member of Congress. Here's what the bill says and what the reaction has been.

The first trans member of Congress expected pushback to her arrival like Nancy Mace's bathroom rule. “Their immaturity is not worthy of being dignified with a response," Sarah McBride told TIME last month.