The deal has sparked competitive and privacy concerns in the US because it would give Google a large amount of control over users’ online habits via cookies and user logs.

We asked the European Commission to look at the proposed acquisition. We believe this deal is positive for both users and advertisers and fosters competition, said Google’s antitrust counsel Julia Holtz, in a statement.

A US Senate Judiciary subcommittee that deals with antitrust issues will hold a hearing into the proposed deal this Thursday entitled An Examination of the Google-DoubleClick Merger and the Online Advertising Industry: What Are the Risks for Competition and Privacy?