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FILE- In this Aug. 23, 2007 file photo, a sign marks the entrance to a gender neutral restroom at the University of Vermont in Burlington, Vt. For opponents of transgender rights, a favorite line of attack is to oppose policies that would allow people to choose whether to use a men’s or women’s bathroom based on gender identity.(AP Photo/Toby Talbot, File)

FILE- In this Aug. 23, 2007 file photo, a sign marks the entrance to a gender neutral restroom at the University of Vermont in Burlington, Vt. For opponents of transgender rights, a favorite line of attack is to oppose policies that would allow people to choose whether to use a men's or women's bathroom based on gender identity.(AP Photo/Toby Talbot, File)