Five of Louisiana's six congressmen have signed off on a letter to Sens. Mary Landrieu and Lisa Murkowski -- chairwoman and ranking member of the Senate Committee on Energy and Natural Resources, respectively -- calling for the upper chamber to clear the way for the Keystone XL pipeline.

The letter, signed by the state's Republican congressmen, boosts H.R. 3, which passed the House in May 2013 and would remove the requirement for a presidential permit for the pipeline.

"The President has not signed energy legislation into law and [Senate Majority Leader Harry] Reid has not allowed a vote on energy legislation in the U.S. Senate for over 4 years," the letter says. “We encourage you to quickly move this or similar legislation through the Senate as soon as possible. Immediate action is required to prevent the needless delay of the Keystone pipeline and similar projects in the future.”

One of the letter's signatories, Rep. Bill Cassidy, is Landrieu's likely Republican challenger this fall. Landrieu has emphasized that her status on the committee will help boost the state's energy industry.

“Building the Keystone pipeline will lower gas prices and create thousands of jobs for Louisiana workers. I voted with the House of Representatives to bypass President Obama and get the pipeline built. I hope the Senate also overcomes the resistance of President Obama and Senator Reid to build the Keystone pipeline.” Rep. Cassidy said.

The Washington Examiner contacted Landrieu's office for comment and plans to update this story with their response.