Leading antitrust lawyers from Williams & Connolly and Wilson Sonsini Goodrich & Rosati have taken up Google’s defense against an antitrust lawsuit that has set the stage for a clash in court between the U.S. Justice Department and one of the world’s wealthiest companies.

After an extensive investigation spanning more than a year, the Justice Department on Tuesday filed an antitrust lawsuit against Google alleging that the tech giant has unlawfully maintained a monopoly in search and search advertising.