DirecTV Chief Executive Officer Mike White on Thursday called for U.S. regulatory scrutiny of Comcast Corps proposed purchase of Time Warner Cable Inc and the effective broadband monopoly he said it might create in as much as two-thirds of the United States. The deal will be reviewed by the Federal Communications Commission and either the U.S. Department of Justice or the Federal Trade Commission, the two agencies that share antitrust oversight in the United States. If the deal is approved as proposed, it clearly represents an unprecedented media concentration in one company, White told analysts on a conference call after DirecTV reported quarterly results. Comcast, when it announced the deal on February 13, said it would not reduce competition because the two cable providers do not compete in any markets.