Chase Strangio, the American Civil Liberties Union‘s go-to transgender lawyer for litigating its top LGBT cases before the Supreme Court, came out as binary-conforming after years of identifying as “nonbinary,” a term for someone who identifies as neither exclusively male nor female.

Strangio’s switch-up has raised eyebrows among opponents of gender ideology, especially as Strangio argues another ACLU case to force the federal government to recognize “nonbinary” status on identification documents.