NEW YORK (AP) — 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...