A group of Republican senators are highlighting concerns that a provision under a key Environmental Protection Agency (EPA) water rule makes it too easy to block fossil fuel projects.

In a Thursday letter lead by Sen. John Barrasso John Anthony BarrassoThe conservative case for phasing out hydrofluorocarbons GOP senator attacks Biden: 'I'm not sure what he recalls' Oil and gas is a partner — not an adversary — in meeting our economic and environmental goals MORE (Wyo.), the five Republicans asked EPA Administrator Andrew Wheeler to send new guidance regarding a statute in the Clean Water Act, which they fear has been used in the past to restrict the development of natural gas pipelines.

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“In the last few years, a troubling trend directed at fossil energy projects has arisen. A select number of states have hijacked Section 401 to delay or block the development of natural gas pipelines and a coal export terminal. While the focus of these abuses today is fossil energy, the approach could be used to target any type of project that is disfavored politically,” GOP Sens. Barrasso, James Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (Okla.), Shelley Moore Capito Shelley Wellons Moore CapitoCongress must finish work on popular conservation bill before time runs out Second GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure MORE (W.Va.), Mike Enzi Michael (Mike) Bradley EnziChamber of Commerce endorses McSally for reelection Cynthia Lummis wins GOP Senate primary in Wyoming The Hill's Convention Report: Democrats gear up for Day Two of convention MORE (Wyo.), and Steve Daines Steven (Steve) David DainesTrump seeks to turn around campaign with Supreme Court fight McConnell locks down key GOP votes in Supreme Court fight Will Republicans' rank hypocrisy hinder their rush to replace Ginsburg? MORE (Mont.) wrote in the letter.

Section 401 mandates that any industry that is applying for a federal permit to allow them to put discharges into a water system must also obtain a certification from the state in which the discharge is coming from to ensure they are complying with water quality standards. The rule can affect chemical plants, power plants or other fossil fuel drilling activities that could lead to pollution of a water source.

The lawmakers said the current statute is being used to “fight” fossil fuel projects rather than protect water quality. They did not offer examples of projects that might have been unfairly struck down under the provision.

“Recent obstruction of energy infrastructure projects has directly threatened national security by forcing reliance on foreign energy and increased air emissions. This obstruction has hurt American workers, states, and tribes,” the letter read.

An EPA spokesperson said the agency is reviewing the lawmakers' letter and is currently reviewing options on how best to provide more nationwide consistency and regulatory certainty for permit applicants and stakeholders under the Clean Water Act.

In August, Barrasso introduced the Water Quality Certification Improvement Act of 2018, which aimed to amend the way the water quality certifications were granted legislatively and change provisions under the Federal Water Pollution Control Act. The same four Republican senators are co-sponsors of the bill.