A proposed rule would allow the EPA to assert its authority over the nation's waterways.
Sen. Heidi Heitkamp (D-N.D.) pressed Senate appropriators to give more money to programs that intended to boost the safety of freight trains that are carrying crude oil shipments.
Support for the renewable fuel standard has grown in the last two years, the Renewable Fuels Association said.
The Transportation Department proposed more than $9.7 million in penalties for safety violations against pipeline operators in 2013.
The legislation would prohibit the Environmental Protection Agency from revoking dredge or fill permits after they are granted.
Lawmakers advanced legislation Wednesday to name a Nevada peak for the late president.
The proposed regulation was created in response to a deadly derailment last year in Canada.
The legislation would expedite natural gas exports to U.S. allies.
Top Environmental Protection Agency officials have had more than 100 meetings with at least 210 groups in crafting its greenhouse gas emissions rule for existing power plants.
The Senate confirmed Neil Kornze as head of Interior's Bureau of Land Management (BLM) Tuesday.