While divesting Google's Ad Manager would not meaningfully reduce Google’s revenue. if found guilty, Google could face $100 billion in litigation from advertisers.

A landmark Justice Department case charging Google with violating antitrust laws in its ad-tech business is set to begin trial in a federal court in Virginia Monday. Why it matters: Google already lost one major antitrust case this year when a federal judge ruled the tech giant illegally abused its search monopoly.

One month after a judge declared Google's search engine an illegal monopoly, the tech giant faces another antitrust lawsuit.