BP Plc (BP.L) asked a U.S. District Court in New Orleans said the lawyer, Patrick Juneau, lacks neutrality because he had advocated for claimants before the court appointed him to run the claims program. It was the latest in a series of legal challenges filed by the London-based oil major, which has complained previously that Juneau has been too generous and liberal when approving claims. Juneau has said he is just applying the rules of the 2012 settlement agreement that was approved by U.S.