A Canadian company's oil pipeline troubles in the U.S., including large spills this summer in Michigan and Illinois, could influence tougher regulatory proposals from Congress.

The U.S. House's Committee on Transportation and Infrastructure has scheduled a Wednesday hearing in Washington primarily to look into a one of the spills. In late July, an estimated 820,000 to 1 million gallons of oil spewed from an Enbridge Inc. pipeline near Marshall, Mich., and polluted the Kalamazoo River.

Committee members also may discuss an Enbridge spill reported within the last week in suburban Chicago. They're also likely to ask regulators about a Pacific Gas & Electric Co. gas pipeline explosion that killed at least four people in suburban San Francisco.