https://arstechnica.com/tech-policy/2021/03/twitter-sues-texas-ag-to-stop-retaliatory-content-moderation-probe/

Twitter is suing Texas Attorney General Ken Paxton, alleging that a probe Paxton launched into its business is an act of retaliation against the platform's choice to ban the account of former US President Donald Trump.

The suit (PDF) accuses Paxton of using his office to "intimidate, harass, and target Twitter in retaliation for Twitter's exercise of its First Amendment rights."