Obama: No guarantee BP attempt will work

President Barack ObamaBarack Hussein ObamaThe true commander in tweet Meghan Markle's pre-royal 'finishing lessons' and an etiquette of equality Hannity on Acosta claim he was tough on Obama: 'Only thing missing were the pom-poms' MORE warned Wednesday there are “no guarantees” BP's latest attempt to plug the leaking well in the Gulf of Mexico will work.

Obama, speaking in Fremont, Calif., said if the “top kill” plan does not work, there are other “approaches that might be viable."

The leaking well is becoming a larger political problem for the administration as oil continues to spill into the Gulf of Mexico from an oil rig explosion 37 days ago. Obama is headed to the gulf on Friday for a second time.

The “top kill” approach involves trying to plug the leak by pumping thousands of barrels of very dense mud into the well.

The president on Wednesday reiterated that he has his top scientists and engineers working to stop the leak.

“We're going to bring every resource necessary to put a stop to this,” Obama said.

The president is set to unveil on Thursday the findings and recommendations of Interior Secretary Ken Salazar's 30-day review of offshore drilling safety before his visit to the Gulf on Friday.

Obama lamented the environmental damage that has already been done from the spill, and pledged his support for a massive clean-up effort.

"We will not rest until this well is shut, the environment is repaired and the clean-up is complete," Obama said.