Directors have released the first trailer for an HBO documentary following the case against California’s same-sex marriage ban Prop 8.

Documentary ‘The Case Against 8′ is directed by Ben Cotner and Ryan White, and looks at the case which eventually saw the US Supreme Court strike-down Prop 8 last year. 

Spanning five years, the footage follows the legal team challenging the ban, and looks at arguments on both sides of the debate.

The documentary will be shown in a limited number of cinemas on 6 June, and will be aired on HBO on 23 June.