the pipeline responsible for supplying a major source of u.s. oil is up and running after an unprecedented shutdown this month. it pumps about 11% of the nation's oil from wells in alaska's north slope. but operations came to a screeching halt when a leak was detected at pump station one in prudhoe bay. bp is one of the companies that owns the pipeline. critics say they're pushing the pipeline to cut corners on maintenance. drew griffin has been following the story. drew is joining us now with the latest. what's going on, drew? >> well, wolf, a lot of the criticism has come from congress itself. the senator from alaska is the latest to call for a hearing. he wants to know if maintenance cuts or delays are causing all this. >> this latest leak led to the