Facebook parent Meta Platforms bought up nascent rivals Instagram and WhatsApp after its attempts to compete had failed, an attorney for the U.S. Federal Trade Commission said at the beginning of a high-stakes trial in Washington on Monday,

Boasberg will also be presiding over the trial and ruling for or against Meta, since there is no jury. His presence adds another layer of intrigue, since he also ruled against Trump’s use of the Alien Enemies Act to deport alleged Venezuelan gang members.

The blockbuster antitrust case begins Monday. Its outcome could impact how Big Tech companies grow—but the government has a long way to go to prove its case.