If a judge orders Google to sell Chrome, it could dramatically upend the multibillion-dollar online search business.

The US government formally proposed a partial breakup of Google on Wednesday, urging a federal judge to force a sale of the company’s Chrome web browser after a landmark ruling this year finding that Google had violated US antitrust law with its search business.

The United States government has proposed forcing Google to sell off its Chrome web browser as part of measures to break up a monopoly a judge has said the company currently operates in online searches.