Nebraska Attorney General Doug Peterson is joining 50 attorneys general in a multistate, bipartisan investigation of tech giant Google’s business practices in regard to state and federal antitrust laws.

Past investigations of Google uncovered violations, ranging from advertising illegal drugs in the U.S. to three antitrust actions brought by the European Commission, Peterson said in the announcement.

When 50 attorneys general come together, they send a strong message,” Peterson said.

Although investigations are already underway, none of them fully address the source of Google’s sustained market power and the ability to engage in serial and repeated business practices with intent to protect and maintain that power, he said.

The bipartisan coalition announced plans to investigate Google’s overarching control of online advertising markets and search traffic that may have led to anti-competitive behavior that harms consumers.

Legal experts from each state will work in cooperation with federal authorities to assess competitive conditions for online services and ensure that Americans have access to free digital markets, Peterson said.