Former President Donald Trump’s frequent use of Twitter lurked in the background as the justices weighed whether an official’s online activities can constitute government action.

The Supreme Court ruled Friday that members of the public in some circumstances can sue public officials for blocking them on social media platforms, deciding a pair of cases against the backdrop of former President Donald Trump’s contentious and colorful use of Twitter.

The court ruled unanimously that officials can be deemed “state actors” when making use of social media and can therefore face litigation if they block or mute a member of the public.

In the two cases before the justices, they ruled that disputes involving a school board member in Southern California and a city manager in Michigan should be sent back to lower courts for the new legal test to be applied.