Missouri's attorney general launched an investigation into Google’s data collection and search practices, saying that the internet giant has so far received a “free pass” by federal regulators.

Josh Hawley, a Republican, announced the probe on Monday, saying that his office has issued a subpoena to Google.

In a press conference, Hawley noted that Google and the Federal Trade Commission announced a settlement in 2013 after a similar investigation centering on whether the company was favoring its own services in search results over those of its competitors.

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“But frankly, the Obama-era FTC did not take any enforcement action against Google, did not press this forward and has essentially given them a free pass,” Hawley said.

The FTC declined to comment.

The investigation will focus on three areas: Google’s data collection practices, allegations that it has been cribbing information from rivals’ sites and whether its search results are giving more prominent placement to the company’s own services.

"We have not yet received the subpoena, however, we have strong privacy protections in place for our users and continue to operate in a highly competitive and dynamic environment," Google spokesman Patrick Lenihan said in a statement.

The Kansas City Star first reported the investigation.

Hawley announced last month that he would be running to unseat Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.). McCaskill is considered one of the most vulnerable Democratic senators on the ballot in 2018.

Google was hit with a record $2.8 billion fine from the European Union in June for giving prominent search result placement to its own comparison shopping service.

The FTC closed a similar investigation into the company in 2013 without a fine, though Yelp, which has been battling the search company for years, has asked the agency to probe whether Google has violated a settlement agreement.

In light of the EU fine, some critics are scrutinizing the FTC’s decision not to take action against Google. FTC staff members had advised filing a lawsuit against Google over its search practices, according to internal documents released to The Wall Street Journal in 2015.

Last month, Rep. Keith Ellison Keith Maurice EllisonOfficers in George Floyd's death appear in court, motion for separate trials Ex-Minneapolis officer involved in Floyd death asks judge to dismiss murder charge Over 50 current, former law enforcement professionals sign letter urging Congress to decriminalize marijuana MORE (D-Minn.) called on the FTC to publicly release the analysis from its investigation.

“There is strong reason to believe that Google has not been acting with the best interest of Missourians in mind,” Hawley said on Monday. “My office will not stand by and let private consumer information be jeopardized by industry giants, especially to pad their profits.”

This story was last updated at 2:02 p.m.