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.

The Justice Department has begun a three-week hearing to determine how to address Google’s illegal monopoly in internet search, with the government calling for major structural changes.

The US government hasn’t broken up a company since AT&T in 1982. Now it’s trying to persuade a judge to make Alphabet Inc.’s Google next.