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>> assess the costs of the keystone pipeline in terms of the carbon pollution it will produce. its clear we should not allow it to be built. >> reporter: but republican lawmakers and a number of red state democrats who want the pipeline approved are blasting the administration. earlier in the month, 11 democratic senators wrote a letter to the president, urging him to make a final decision. among them is alaska senator mark begich who says, quote, i am frankly appalled at the continued foot-drag...

>> they want to assess the costs of the keystone xl pipeline in terms of the carbon pollution it will produce. its clear that we should not allow it to be built. >> reporter: republican lawmakers and a number of red state democrats who want the pipeline approved are blasting the administration. earlier in the month, 11 democratic senators urged the president to make a final decision. louisiana senator mary landrieu reacting, quote, saying the decision is irresponsible, unnecessary and unacceptab...