Roughly 35 bills are being proposed that would limit or prohibit transgender women from competing in women’s athletics. Above, athletes run in the Women’s 400 meter final during the Rio 2016 Olympic Games.

RIO DE JANEIRO, BRAZIL – AUGUST 15: A general view as athletes run in the in the Women’s 400m final on Day 10 of the Rio 2016 Olympic Games at the Olympic Stadium on August 15, 2016 in Rio de Janeiro, Brazil. (Photo by Shaun Botterill/Getty Images)