(CNN) - EPA administrator Lisa Jackson said Friday there is a chance that workers will be able to stop the flow of oil into the Gulf of Mexico, but warned that the EPA is preparing for the worst.
"There is still the opportunity and the possibility that they would be able to shut it down," Jackson told CNN Chief National Correspondent John King. "Of course as responders we have to look at the worst case, and keep planning for that."
Jackson's comments come as the federal government is ramping up the pressure on BP to do more to stop well leaks gushing thousands of barrels of oil into waters off Louisiana. The government is also pushing BP to beef up its response as a giant oil slick approaches the Louisiana coast.
In the interview on CNN’s John King USA that aired Friday, Jackson responded to questions about the level of trust the Obama administration had in BP immediately following the April 20 oil rig explosion that also resulted in 11 presumed deaths.
"I don't think it was ever a question of trust in the company, I think it was a question of responding to the set of facts as we came to understand them,” Jackson said. “The situation has certainly worsened. It began as a human tragedy, it is now what I think is an environmental challenge of the highest order."
In the interview, Jackson echoed comments made earlier in the day by Secretary of the Interior Ken Salazar, insisting that BP will be held responsible.
"Every person that has met with BP, every federal official has made it absolutely clear that under the current laws, they are the responsible entity, and they are supposed be out doing everything they can, everything we instruct them to do."
Read more about the oil spill here.