The Gulf of Mexico oil spill seeped miles deeper into Louisiana's fragile marshes, making it tougher to clean up or to rescue wildlife like the brown pelican, as the federal government questioned whether BP will be able plug its blown-out well on the seabed.
With frustration mounting at the global oil giant and at the government, the Obama administration pressured BP PLC to fix the gusher finally after several failed ventures in the weeks since an April 20 oil rig explosion.
Secretary of the Interior Ken Salazar said Sunday he was that BP knows what it's doing.
"If we find they're not doing what they're supposed to be doing, we'll push them out of the way appropriately," Salazar said.
Special Section: Disaster in the Gulf
The White House said the Justice Department has been gathering information about the oil spill in the Gulf of Mexico.
Press secretary Robert Gibbs didn't say whether the department has opened a criminal investigation. He would only tell CBS' "Face the Nation" on Sunday that department representatives have been to the Gulf as part of the response to the BP oil leak.
Salazar and Secretary of Homeland Security Janet Napolitano were to lead a Senate delegation to the region Monday to fly over affected areas.
From the beginning, the U.S. has insisted that BP was responsible for taking the lead role to stanch the spill.
" , they own the well, they're responsible for capping it," Gibbs told Face the Nation host Bob Schieffer Sunday.
But BP's chief operating officer Don Suttles said Monday that "the federal government does have ultimate control of this event."
"I think what we see is a huge a frustration. We share it. I share the secretary's frustration. I want this thing to stop. We want it stopped. The people who live here want it to stop. I'm doing everything we can. I don't know anything we could be doing that we aren't doing," he said on CBS' "The Early Show".
And there are local jurisdictions which complicate the efforts.
Rear Admiral Mary Landry told CBS Evening News anchor Katie Couric that there are many different parties that need to be coordinated with.
For example, a local mayor told the coast guard they didn't want oil-soaking booms used around the beach because it would be unsightly for beachgoers, reports Couric. But Landry said they have to respect the wishes of local leaders.
BP is getting barges and other equipment ready to prepare for a risky procedure midweek that the company hopes will finally halt the gusher.
But the "top kill" maneuver, which shoots heavy mud and then cement into the blown well, has never been tried at 5,000 feet underwater and BP officials caution they are working on a range of backup plans.
Suttles said that officials would know "fairly quickly" if the "top kill" attempt is effective.
Even if it works, the damage has been done.
On Sunday, some brown pelicans coated in oil couldn't fly away on Barataria Bay of the Louisiana coast. All they could do was hobble. Their usually brown and white feathers were jet black, and eggs were glazed with rust-colored gunk.
When wildlife officials tried to rescue one of the pelicans, the birds became spooked. Officials weren't sure whether they would try again, and U.S. Fish and Wildlife spokeswoman Stacy Shelton said it is sometimes better to leave the animals alone than to disturb their colony.
More Oil Spill Coverage:
BP Tube Collecting Less Oil; Islands Oil-Soaked
White House: Oil Spill Isn't Our Katrina
Oily Mess Along Gulf Coastline
Pressure Grows for Gov't To Take Over From BP
Oil Spill: One Month Later
Gov. Pressed to Act Over BP
Scientists: Don't "Squander" Lesson of Oil Spill
Live Video Feed of Underwater Gusher
Pelicans are especially vulnerable to oil because they dive through the water's surface to feed. They could eat tainted fish and feed it to their young, and they could die of hypothermia or drown if their feathers become soaked in oil. Just six months ago, the birds had been removed from the federal endangered species list.
With oil pushing at least 12 miles into Louisiana's marshes and two major pelican rookeries now coated in crude, Louisiana Gov. Bobby Jindal said the state has begun work on a chain of berms, reinforced with containment booms, that would skirt the state's coastline.
"As we talk, a total of more than 65 miles of our shoreline now has been oiled," Jindal said.
Jindal, who visited one of the affected pelican nesting grounds Sunday, said the berms would close the door on oil still pouring from a mile-deep gusher about 50 miles out in the Gulf. The berms would be made with sandbags; the U.S. Army Corps of Engineers also is considering a broader plan that would use dredging to build sand berms across more of the barrier islands.
At least 6 million gallons of crude have spewed into the Gulf, though some scientists have said they believe the spill already surpasses the 11 million-gallon 1989 Exxon Valdez oil spill off Alaska as the worst in U.S. history.
A mile-long tube operating for about a week has siphoned off more than half a million gallons in the past week, but it began sucking up oil at a slower rate over the weekend. Even at its best, the effort did not capture all the oil leaking.
The spill's impact now stretches across 150 miles, from Dauphin Island, Ala. to Grand Isle, La.
At Barataria Bay, globs of oil soaked through containment booms set up in the area. Plaquemines Parish President Billy Nungesser said BP needed to send more booms. He said it would be up to federal wildlife authorities to decide whether to try to clean the oil that has already washed ashore.
"The question is, will it do more damage because this island is covered with the mess?" Nungesser said.
Officials have considered some drastic solutions for cleaning the oil like burning or flooding the marshes but they may have to sit back and let nature take care of it.
Plants and pelican eggs could wind up trampled by well-meaning humans. If the marshes are too dry, setting them ablaze could burn plants to the roots and obliterate the wetlands.
Flooding might help by floating out the oil, but it also could wash away the natural barriers to flooding from hurricanes and other disasters much like hurricanes Katrina and Rita washed away marshlands in 2005. State and federal officials spent millions rebuilding the much-needed buffer against tropical storms.
On Sunday, oil reached an 1,150-acre oyster ground leased by Belle Chasse, La., fisherman Dave Cvitanovich. He said cleanup crews were stringing lines of absorbent boom along the surrounding marshes, but that still left large clumps of rust-colored oil floating over his oyster beds. Mature oysters might eventually filter out the crude and become fit for sale, but this year's crop of spate, or young oysters, will perish.
"Those will die in the oil," Cvitanovich said. "It's inevitable."
© 2010 CBS Interactive Inc. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.