ARCHIVE PHOTO: A Google logo printed in 3D is seen in this illustration, taken on April 12, 2020. REUTERS / Dado Ruvic / Illustration
The Justice Department is also moving to open a case later this summer, the Wall Street Journal reported on Friday.
Alphabet's shares fell about 1.5% in non-business hours.
Google – along with Facebook, Amazon.com and Apple – are under a series of investigations into allegations that tech giants use their influence to unfairly defend their market share, including one from the House Judiciary Committee's antitrust panel.
Google's federal investigation focuses on researching, advertising and managing its Android operating system. The Federal Trade Commission closed a Google antitrust investigation in 2013 with a rebuke.
Texas Attorney General Ken Paxton, who leads the investigation in several states, said he was talking to companies that said they were hurt by the search and advertising giant.
"Our antitrust investigation at Google was not delayed by the coronavirus pandemic," he said in a statement. “We hope to have the investigation closed in the fall. If we determine that the claim is deserved, we will go to court soon after that. "
Paxton said in February that he took no possible punishment, including breaking the search and advertising giant.
Google said it would not comment on speculation about the potential for litigation.
"We continue to engage in ongoing investigations led by the Department of Justice and Attorney General Paxton, and we have no updates or comments on speculation," a Google spokesman said in an e-mailed statement.
The Justice Department did not immediately respond to a request for comment.
The four tech giants, who are powers in online search and advertising, social media, online sales and smartphones, have caused concern among progressive Democrats and conservative Republicans because of their enormous influence.
The Justice Department is believed to be looking at all four companies, while the FTC is investigating Facebook and Amazon.com. Dozens of state attorney generals, led by New York, are also investigating Facebook.
Reporting by Diane Bartz in Washington and Akanksha Rana in Bengaluru; Editing by Shailesh Kuber and Sonya Hepinstall