President Donald Trump’s practice of blocking critics on Twitter runs afoul of the First Amendment, a federal appeals court in New York ruled on Tuesday.

Writing for a three-judge panel for the US Court of Appeals for the Second Circuit in Manhattan, Judge Barrington Parker said that the president’s @realDonaldTrump account on Twitter is indeed a public forum and that “once the President has chosen a platform and opened up its interactive space to millions of users and participants, he may not selectively exclude those whose views he disagrees with.”

In oral arguments for the case in March, the appeals judges repeatedly pushed back on the Justice Department’s argument that Trump could use his Twitter account to disseminate government policy but that the account doesn’t count as a public forum.

The panel’s ruling upholds Manhattan federal Judge Naomi Reice Buchwald’s ruling in the case. After that ruling, Trump unblocked critics but still appealed the ruling.

The Justice Department did not immediately comment.

Trump has over 60 million followers on Twitter.

In a statement, the Knight First Amendment Institute at Columbia University, which brought the legal challenge, said the Second Circuit’s ruling will help “ensure the vitality of digital spaces that are increasingly important to our democracy.”

“Public officials’ social media accounts are now among the most significant forums for discussion of government policy,” Jameel Jaffer, the Knight Institute’s executive director, said in a news release.