The Wall Street Journal reported yesterday that the U.S. Justice Department has hired a well-known lawyer for a possible antitrust lawsuit against Google. The lawyer, Sanford Litvack, was the Justice Department antitrust chief for President Jimmy Carter as well as a former vice chairman of Disney and partner at law firm Hogan & Hartson. The report says that it is not clear if the possible challenge would be to the Google-Yahoo search advertising partnership alone or if it would encompass Google’s overall online-advertising business. Lawyers familiar with the review told the Journal that “For weeks, U.S. lawyers have been deposing witnesses and issuing subpoenas for documents to support a challenge to the deal.”