WASHINGTON — Google will return to federal court Friday to fend off the U.S. Justice Department's attempt to topple its internet empire at the same time it's navigating a pivotal shift to artificial intelligence that could undercut its power.

The legal and technological threats facing Google are among the key issues that will be dissected during the closing arguments of a legal proceeding that will determine the changes imposed upon the company in the wake of its dominant search engine being declared as an illegal monopoly by U.S. District Judge Amit Mehta last year.

Brandishing evidence presented during a recent three-week stretch of hearings , Justice Department lawyers will attempt to persuade Mehta to order a radical shake-up that includes a ban on Google paying to lock its sea

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