New York (CNNMoney.com) - Lawmakers ripped into BP chief Tony Hayward on Thursday, accusing him of being ill-prepared for congressional testimony and not cooperating with an investigation into the Gulf of Mexico oil spill.
In Hayward's first congressional appearance since the April 20 disaster, lawmakers wanted to know if BP had cut corners in an effort to save money in the run up to the explosion.
Questions during the 7-1/2 hour hearing, which included two recesses, focused on the well's design and the measures taken while BP was attempting to seal it before it exploded.
"Did BP make a fundamental misjudgment" in using one long piece of well casing instead of many shorter pieces, as other oil companies said they would have done, asked Rep. Henry Waxman, D-Calif.
"I wasn't involved in that decision," replied Hayward, saying that the single piece was better for the well's long-term stability.
Waxman produced transcripts from BP's engineers saying that the single casing was "unlikely to be successful." Waxman said BP went ahead with it anyway to save $7 to $10 million.
Hayward said he was "not prepared to draw conclusions about this accident until the investigation is complete."
"This is an investigation," said Waxman. "Are you cooperating with other investigations? Because they're going to have a hard time reaching a conclusion if you stonewall them, which it appears you are doing today."