The US Department of Justice is preparing to sue Google over ad market as soon as September

In December 2020, attorneys general for 16 states and Puerto Rico also sued Google for allegedly monopolising the online digital advertising market. — Photo by Pawel Czerwinski on Unsplash

The US Justice Department is preparing to sue Google as soon as next month, according to people familiar with the matter, capping years of work to build a case that the Alphabet Inc unit illegally dominates the digital advertising market.

Lawyers with the DOJ’s antitrust division are questioning publishers in another round of interviews to refresh facts and glean additional details for the complaint, said three people familiar with the conversations who asked not to be named discussing an ongoing investigation.