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Lamar McKay, former president of BP America and current chief executive of BP's Upstream unit, leave Federal Court after testifying in New Orleans on Monday, Feb. 25, 2013. McKay testified Tuesday that BP and its contractors share responsibility for preventing blowouts like the Macondo well blowout and rig explosion off Louisiana that killed 11 workers on April 20, 2010, spawning the massive spill. (AP Photo/Bill Haber)

Activists protest in front of the Hale Boggs Federal Building on the first day of the trial over the Deepwater Horizon oil rig spill in New Orleans, Louisiana February 25, 2013. Nearly three years after a deepwater well rupture killed 11 men, sank a rig and spewed 4 million barrels of oil into the Gulf of Mexico, BP and the other companies involved are about to face their day in court. REUTERS/Jonathan Bachman

Activists holds signs during a protest in front of the Hale Boggs Federal Building on the first day of the trial over the Deep Water Horizon oil rig spill on February 25, 2013 in New Orleans, Louisiana. 11 men were killed during the accident and over 4 million barrels of oil spilled into the Gulf of Mexico in 2010. (Photo by Sean Gardner/Getty Images)

An activist holds a sign during a protest in front of the Hale Boggs Federal Building on the first day of the trial over the Deep Water Horizon oil rig spill on February 25, 2013 in New Orleans, Louisiana. 11 men were killed during the accident and over 4 million barrels of oil spilled into the Gulf of Mexico in 2010. (Photo by Sean Gardner/Getty Images)

A Capitol Hill police officer arrests Diane Wilson on Capitol Hill in Washington as BP CEO Tony Hayward testifies before the Energy and Environment subcommittee on Oversight and Investigations hearing on the role of BP in the Deepwater Horizon Explosion and oil spill in this June 17, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began on Monday, Feb. 25, 2013. (AP Photo/Haraz N. Ghanbari, File)

BP senior vice president Kent Wells rubs his eyes while testifying during the Deepwater Horizon joint investigation hearings by the U.S. Coast Guard and the Interior Department's Bureau of Ocean Management, Regulation and Enforcement in Houston in this Aug. 26, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/David J. Phillip, Pool, File)

U.S. Secretary of the Interior Ken Salazar speaks to the media during a visit to the Fort Jackson Wildlife Rehabilitation Center on May 15, 2010 in Buras, Louisiana. Oil continues leaking out of the Deepwater Horizon wellhead as BP continues to work on containing the spill in the Gulf of Mexico off the Louisiana coast. (Photo by John Moore/Getty Images)

President Barack Obama and LaFourche Parish President Charlotte Randolph look at oil washed up as "tar balls" in Port Fourchon, La., during a tour of areas affected by the Gulf Coast oil spill in this May 28, 2010 file photo. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Evan Vucci, File)

Oil leaks from the drill pipe of the Deepwater Horizon drilling rig after it sank on April 22, 2010, two days after it exploded. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP photo/US Coast Guard, File)

Crude oil from the Deepwater Horizon oil spill washes ashore in Orange Beach, Ala. on June 12, 2010. The U.S. Justice Department and the five Gulf coast states most affected by a massive 2010 oil spill have all indicated they would like to reach a settlement on civil claims against BP PLC that would avoid a trial scheduled to start next week. (AP Photo/Dave Martin, File)

Smoke billows from a controlled burn of spilled oil off the Louisiana coast in the Gulf of Mexico coast line on June 13, 2010. A U.S. judge has accepted an agreement by BP Plc to plead guilty for its role in the Deepwater Horizon disaster and pay $4.5 billion in penalties for the worst offshore oil spill in U.S. History. REUTERS/Sean Gardner

A sea bird is mired in oil on the beach at East Grand Terre Island along the Louisiana coast on June 3, 2010. Oil from the Deepwater Horizon has affected wildlife throughout the Gulf of Mexico. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Charlie Riedel, File)

A decomposed fish lies in the water as workers pick up oil balls from the Deepwater Horizon oil spill in Waveland, Mississippi on July 7, 2010. The trial to decide who should pay for the 2010 Gulf of Mexico oil spill - the worst offshore oil spill in U.S. history began on February 25, 2013 in New Orleans before a federal judge. REUTERS/Lee Celano

People hold hands during a Hands Across the Sand event in Tybee Island, Ga., on June 26, 2010, about two months after the explosion of the Deepwater Horizon oil rig in the Gulf of Mexico. A high-stakes trial to assign blame and help figure out exactly how much more BP and other companies should pay for the spill began Monday, Feb. 25, 2013. (AP Photo/Stephen Morton, File)

People gather near crosses on Wednesday, April 20, 2011 for the 11 workers who died in the Deepwater Horizon oil rig explosion and for the Gulf of Mexico during a vigil to mark the first anniversary of the BP PLC oil spill on a beach in Grand Isle, La. A U.S. judge on Tuesday, Jan. 29, 2013, approved an agreement for British oil giant BP PLC to plead guilty to manslaughter and other charges and pay a record $4 billion in criminal penalties for the company's role in the 2010 oil disaster in the Gulf of Mexico. (AP Photo/Patrick Semansky)