Sen. Graham doesn't fault Obama for not stopping oil leak off Gulf Coast

"We're trying everything under the sun to stop the leak and it's not his fault that we can't find a way to cap it," Graham said in an interview on Bloomberg Television's "Political Capital with Al Hunt."

"I would give him fairly low marks in terms of responding to the consequences of the spill," he said, "but stopping the leak, nobody could do it better."

The gulf oil spill began nearly two months ago after an explosion on the Deepwater Horizon drilling rig. The Obama administration has come under heavy criticism for failing to respond quickly to the problem as BP engineers and the federal government searched for weeks for a way to contain the spill or plug the well.

A containment cap is currently placed on the oil well, but millions of barrels of oil have already leaked into the gulf and are beginning to wash ashore in Louisiana, Mississippi, Alabama and Florida. 

The administration Friday also upped its estimate of the magnitude of the spill.

Earlier, the administration estimated that between 12,000 and 19,000 barrels were leaking each day. On Friday, the administration doubled those numbers to between 25,000 and 30,000 barrels.

The administration said repeatedly that it was engaged on the oil spill since the beginning. 

Obama is slated to head to the gulf region on Monday for his fourth trip since the spill began. Also, Obama is set to meet mid-week with top BP officials.