Update (0915ET): Reuters has some more details about Tuesday's Google lawsuit, which the DoJ has now confirmed.

GOOGLE CASE IS MOST SIGNIFICANT ANTITRUST ACTION IN DECADES

GOOGLE ABUSED ITS DOMINANT POSITION IN SEARCH MARKET, U.S. SAYS

GOOGLE ACCUSED BY U.S. OF ABUSING MARKET POWER IN LANDMARK CASE

US GOOGLE ANTITRUST CASE JOINED BY ELEVEN STATES

More official details are expected during a briefing set for Tuesday morning, but many of the key details have already appeared in press reports.

Republican Sen Josh Hawley accused Google of keeping power through "illegal means" and called the lawsuit "the most important antitrust case in a generation." Reuters also note that the federal lawsuit marks a rare moment of comity between the Trump Administration and progressive Democrats like Sen Elizabeth Warren, who has called for "swift, aggressive action."

Sen Ted Cruz took to CNBC's Squawk Box earlier to trash Google and its Big Tech peers for abusing their market position and censoring conservative voices.