Texas Attorney General Ken Paxton has announced that he was leading a lawsuit against Google, accusing the tech giant of taking "illegal" actions to hurt competition in the advertising technology market.
In a tweet on Wednesday, Paxton said his suit centres on the lucrative market for digital ads, where Google obtains most of its revenue.
Google didn't immediately respond to a request for comment.
The case marks the second antitrust action against Goggle after the US Justice Department filed a landmark monopolisation case against the company in October.
The lawsuit is yet another legal battle for Google, which is facing