President Donald Trump lost a major Twitter fight Tuesday when a federal appeals court said that his daily musings and pronouncements were overwhelmingly official in nature and that he violated the First Amendment whenever he blocked a critic to silence a viewpoint.

The effect of the 2nd U.S. Circuit Court of Appeals decision is likely to reverberate throughout politics after the Manhattan court warned that any elected official using a social media account “for all manner of official purposes” and then excluding critics violates free speech.

“The government is not permitted to ‘amplify’ favored speech by banning or burdening viewpoints with which it disagrees,” the appeals court said.

Because it involved Trump, the ruling is getting more attention than a January decision by the 4th U.S. Circuit Court of Appeals that found a Virginia politician violated the First Amendment rights of one of her constituents by blocking him from a Facebook page.

Still, the appeals court in New York acknowledged, not every social media account operated by a public official is a government account, and First Amendment violations must be considered on a case-by-case basis.