An internet trade group asked the Supreme Court Wednesday to block Mississippi from enforcing its age-verification law against nine major social media platforms.

NetChoice asked the justices for an emergency intervention after the 5th U.S. Circuit Court of Appeals last week without explanation lifted a block that had protected platforms like Facebook and Instagram from the new requirements.

“In a one-sentence order, the Fifth Circuit upended the First Amendment rights of Mississippi citizens seeking to access fully protected speech across social media websites,” NetChoice wrote.

The existing block had prevented Mississippi........

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