The proposed merger of ticketing giant Ticketmaster and Live Nation, the world's largest concert promoter, should be closely scrutinized by the Justice Department, according to the chair of a Senate antitrust subcommittee and 50 members of the U.S. House of Representatives on Monday.

Sen. Herb Kohl, chair of the Judiciary Committee's antitrust subcommittee, said the merger would combine Ticketmaster, the nation's dominant ticket seller, with Live Nation, which has its own ticketing business.

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