BP is fighting the settlement it agreed to last summer that let the oil company avoid thousands of potential lawsuits over the 2010 Gulf of Mexico oil spill.

Just after the spill, when oil was still gushing into the Gulf, BP touted the $20 billion it set aside for claims. But now it says the claim process is corrupt and is hoping a court will overturn the settlement that established the claims fund.

Ending the claims would mean stopping a well-oiled machine.