Efforts by U.S. antitrust regulators to break up Alphabet by forcing a sale of its Google Chrome browser and other proposals to limit its search dominance are likely to run into legal challenges on grounds the remedies are extreme.

The spinoff would be a major blow to the tech giant and will likely kick off a legal fight with wide-reaching implications for its core business.

The U.S. Department of Justice argued Wednesday that Google should divest its Chrome browser to help break up the company's illegal monopoly in online