The DOJ will seek to have Google sell off its ad exchange and publisher ad server business in a process expected to take several years.

Sundar Pichai was called as a trial witness by the Department of Justice, who is accusing Google of illegally maintaining its monopoly in search.

The US Justice Department asked a federal judge on Friday to force Alphabet Inc.’s Google to sell key parts of its advertising technology and share realtime data with competitors to address a ruling that the technology giant illegally monopolizes much of the market for placing ads around the web.