Microsoft CEO Satya Nadella warned on Monday of a “nightmare” scenario for the internet if Google’s dominance in online search is allowed to continue, a situation, he said, that starts with searches on desktop and mobile but extends to the emerging battleground of artificial intelligence.

Nadella testified on Monday as part of the US government’s sweeping antitrust trial against Google, now into its 14th day. He is the most senior tech executive yet to testify during the trial that focuses on the power of Google as the default search engine on mobile devices and browsers around the globe. READ MORE