Federal energy regulators on Tuesday indicated they do not see a national security risk from the closure of coal and nuclear power plants in the U.S.

Asked by Sen. Martin Heinrich Martin Trevor HeinrichSenate Democrats demand White House fire controversial head of public lands agency Senate Democrats seek removal of controversial public lands head after nomination withdrawal Five takeaways from final Senate Intel Russia report MORE (D-N.M.) at a Senate Energy and Natural Resources Committee hearing whether they believed the U.S. faced a national security emergency in wholesale power markets because of the closures, none of the five members of the Federal Energy Regulatory Commission (FERC) answered in the affirmative.

Four of the five members were appointed by President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE.

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Energy Secretary Rick Perry Rick PerryEnergy secretary questions consensus that humans cause climate change OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium OVERNIGHT ENERGY: Trump signs major conservation bill into law | Senate votes to confirm Energy's No. 2 official | Trump Jr. expresses opposition to Pebble Mine project MORE last fall submitted a controversial proposal to subsidize struggling U.S. coal and nuclear plants, arguing it was necessary to keep the power grid dependable.

FERC unanimously rejected the multibillion dollar proposal in January, saying it was not legally defensible.

U.S. coal and nuclear plants are facing increased competition in the U.S. from renewable energy. This has led to a number of plant closures and calls for help from the federal government.

FERC member Richard Glick told the panel he was "sympathetic to the plight of coal miners who have been disproportionately affected" as coal's slice of the nation's energy production has fallen.

However, he said, it was not FERC's job to determine how to help the struggling communities.

"FERC has a responsibility to ensure the reliability and resilience of the grid. And we should take our duty seriously. But we cannot try to stop the natural evolution of this industry by claiming there is a national security emergency unless there is evidence that that emergency exists," he said.

Sen. Maria Cantwell Maria Elaine CantwellHillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes Bipartisan senators call for investigation of popular fertility app The Hill's Coronavirus Report: Mike Roman says 3M on track to deliver 2 billion respirators globally and 1 billion in US by end of year; US, Pfizer agree to 100M doses of COVID-19 vaccine that will be free to Americans MORE (D-Wash), the panel's ranking member, criticized the prospect of a bailout.

"In my view you started things off right by rejecting Secretary Perry's radical proposal to force consumers to bail out noncompetitive coal — not only do I believe the underlying policy is wrong. but it’s a threat on your oversight and independence to be directed this way," Cantwell said in her opening statement.

Sen. Lisa Murkowski Lisa Ann MurkowskiClub for Growth to spend million in ads for Trump Supreme Court nominee Pebble Mine CEO resigns over secretly recorded comments about government officials Maryland's GOP governor says Republicans shouldn't rush SCOTUS vote before election MORE (R-Alaska), the panel's chairwoman, said closures had "not reached the point where the quality of electric service have been visibly compromised."

In April, First Energy, a coal and nuclear company with plants in Ohio and Pennsylvania, filed for bankruptcy and subsequently asked Perry for a federal bailout, calling it an emergency and security risk.

"The continued retirement of nuclear and coal-fired generating facilities in PJM (Interconnection) has resulted in an emergency situation that has placed the continuing security of PJM at risk,” the company wrote to Perry.

While Perry did not grant the bailout, President Trump has been vocal about his desire to help coalminers.

In early June, the White House called on Perry to take immediate steps to help struggling coal and nuclear power plants, White House press secretary Sarah Huckabee Sanders told reporters.

"Keeping America's energy grid and infrastructure strong and secure protects our national security. ... Unfortunately, impending retirements of fuel-secure power facilities are leading to a rapid depletion of a critical part of our nation's energy mix, and impacting the resilience of our power grid," she said in a statement.

Some energy companies and grid operators have pushed back on Trump's plan, including PJM Interconnection, the nation's largest power grid operator.

"Any federal intervention in the market to order customers to buy electricity from specific power plants would be damaging to the markets and therefore costly to consumers," said the operator in a statement at the time. "There is no need for any such drastic action."