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WASHINGTON (Reuters) - An acquisition of Time Warner Inc by AT&T Inc. could raise significant antitrust issues that the U.S. Senate committee on antitrust would carefully examine, the chairman and ranking member of the committee said Sunday.

AT&T announced on Saturday a deal to buy Time Warner for $85.4 billion, the boldest move yet by a telecommunications company to acquire content to stream over its network to attract a growing number of online viewers.