WASHINGTON -- President Obama will direct federal regulators on Monday to move swiftly on an application by California and 13 other states to set strict automobile emission and fuel efficiency standards, two administration officials said Sunday, according to The New York Times.

The directive makes good on an Obama campaign pledge and signifies a sharp reversal of Bush administration policy. Granting California and the other states the right to regulate tailpipe emissions would be one of the most emphatic actions Mr. Obama could take to quickly put his stamp on environmental policy.

Mr. Obama's presidential memorandum will order the Environmental Protection Agency to reconsider the Bush administration's past rejection of the California application. While it stops short of flatly ordering the Bush decision reversed, the agency's regulators are now widely expected to do so after completing a formal review process.

Once they act, automobile manufacturers will quickly have to retool to begin producing and selling cars and trucks that get higher mileage than the national standard, and on a faster phase-in schedule. The auto companies have lobbied hard against the regulations and challenged them in court.