Google on Friday faced a demand by the US government to break up its hugely profitable ad technology business. The request came after a judge found the tech giant was commanding an illegal monopoly for the second time in less than a year.

“We have a defendant who has found ways to defy” the law, US government lawyer Julia Tarver Wood told a federal court in Virginia, as she urged the judge to dismiss Google’s assurance that it would change its behavior. “Leaving a recidivist monopolist” intact was not appropriate to solve the issue, she added.