Dozens of transgender people, along with their families and allies, gathered outside the Supreme Court on Wednesday as the justices considered a Tennessee law banning access to puberty blockers and hormone therapy for trans minors.

The wide-ranging argument at the Supreme Court touched on the approaches of other nations, the relevance of a previous ruling protecting transgender workers from workplace discrimination and the rights of parents.

The Supreme Court was more than an hour into its feisty debate over gender-affirming care when Justice Ketanji Brown Jackson invoked one of the most significant civil rights precedents in the nation’s history.