The outcome of the trial could fundamentally reshape the internet by unseating Google as the go-to portal for information online.

Alphabet's Google needs strong measures imposed on it to prevent it from using its artificial intelligence products to extend its dominance in online search, a U.S. Department of Justice attorney said as a trial in the historic antitrust case began on Monday.

A federal judge last year ruled the company had been making anticompetitive deals to stifle competition for its search engine. Google now faces the penalty phase.