The US Justice Department and a group of states proposed major changes to Alphabet Inc.’s Google — including a forced sale of the company’s Chrome web browser — after a landmark ruling that the tech giant illegally monopolized online search.

Federal officials said the divestment would “permanently stop” Google’s control over the search engine monopoly.

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.