Fifty U.S. states and territories, led by Texas, have announced an antitrust investigation into Google's 'potential monopolistic behavior' as they examine whether the Silicon Valley tech giant has gotten too big and effective at stomping or acquiring rivals.

Texas Attorney General Ken Paxton formally announced the probe on Monday and said it would focus on Google's advertising business.

States have formally requested documents from Google on its advertising business.

Nearly all the country’s attorneys general are now putting their weight behind antitrust investigations of Big Tech. And while the state-led probes will turn up the heat on companies like Google and Facebook, they will also likely add pressure to federal regulators who have launched their own investigations into the industry, according to antitrust experts.

There is a major force uniting America’s fiercely partisan politicians: big technology companies. Democrats and Republicans at the federal and state levels are coming together to scrutinize the power of the Silicon Valley giants and, potentially, to rein them in.

Letitia James, the Democratic attorney general of New York, announced on Friday that attorneys general in eight states — four Democrats and four Republicans — and the District of Columbia had begun an antitrust investigation of Facebook.