Google is constantly under antitrust scrutiny these days, whether it's for large acquisitions into new markets such as its proposed ITA deal or for its general dominance in search. The company has faced antitrust investigations in Europe . But now Google faces possible antitrust hearings in the U.S. Senate . Senator Herb Kohl (Democrat from Wisconsin), who is the Chairman of the Senate Subcommittee on Antitrust, Competition Policy, and Consumer Rights, announced his subcommittee's agenda today for the 112th Congress. One of the planned agenda items is a probe into Google's "dominance over Internet search" and "allegations raised by e-commerce websites that compete with Google that they are being treated unfairly in search ranking, and in their ability to purchase search advertising."