As BP readied its latest fallback plan to stop oil gushing from one of its wells in the Gulf of Mexico, the Obama administration and the company warned that the crude could continue flowing until August, compounding threats to coastal wetlands, fisheries and beaches.

White House energy and climate adviser Carol M. Browner said Sunday that the oil spill was "probably the biggest environmental disaster we've ever faced in this country" and that "we are prepared for the worst." On the CBS show "Face the Nation," she said that the "American people need to know that it is possible we will have oil leaking from this well until August when the relief wells will be finished."

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