UPDATE: More from DOJ:
The White House is expected to nominate Christine Varney, a former Federal Trade Commission member and Internet-law expert, as Justice Department antitrust chief, people briefed on the move said. Jon Leibowitz, a current FTC member, is the leading candidate for commission chairman, but the decision isn’t final, these people said. Both are known to favor aggressive enforcement and would mark a change from the Bush administration, which pursued scores of price-fixing cases but challenged few mergers and rarely acted against alleged monopoly conduct.