The missive comes just weeks before the agency’s expected ruling on its tailpipe-emissions proposal, which addresses both climate change and pollutants that are harmful to health.

It is the second letter that auto dealers have sent to the White House in two months on the EPA’s upcoming ruling, which could codify the agency’s strictest-ever tailpipe emissions limits, proposed last April. The dealerships said Thursday that the Biden administration did not respond to their first letter sent on Nov. 28.

An EPA spokesperson said the agency cannot comment as the proposal is currently in the interagency review process.

“President Biden is investing in a future that is made in America by American workers as we position the United States to lead the clean energy future,” a White House spokesperson said in a statement Thursday. “More Americans are buying EVs every day—with EV sales rising faster than traditional gas-powered cars—as the President’s Inflation Reduction Act makes EVs more affordable and helps Americans save money when driving.”

With the world focused on trying to limit warming to no more than 1.5-degree Celsius temperature above pre-industrial times, the administration has an ambitious goal to cut domestic planet-warming greenhouse gas emissions in half by 2030. Part of its focus is on the transportation sector, 58% of the emissions from which come from passenger cars and trucks, according to the EPA. The regulation also limits hydrocarbons, nitrogen oxides, and particulate matter into the air. These emissions cause a host of health issues and disproportionately affect people who live near heavy traffic.

The EPA says its proposed regulations could mean that up to two out of every three vehicles sold in the U.S. are electric by 2032. That’s higher than the administration’s target of 50% set two years ago.

The regulations, which impact light- and medium-duty vehicles beginning with the 2027 model year, could mean a 56% drop in projected greenhouse gas emissions from the fleet, relative to existing standards, avoiding nearly 7.3 billion metric tons of carbon dioxide emissions by 2055. They also reduce pollutants harmful to health by 60% from the existing standard by model year 2032.

Most automakers around the globe have pledged hundreds of billions of dollars to transition to all-electric new vehicle sales in the coming decade as momentum to address climate change builds. Last year, U.S. EV sales overall grew 47% to a record 1.2 million, according to Motorintelligence.com. EVs are seeing year-over-year growth, but only hit 7.6% of overall market share in 2023.

Given that, thousands of auto dealers say they won’t be able to meet the EPA’s stringent goals.

Nearly 4,000 dealerships of the nearly 17,000 franchised shops nationwide asked Biden to “tap the brakes” on the EPA proposal in the November letter, referring to the rules as an “electric vehicle mandate.” House Republicans approved a bill in December to block the pollution limits and also called the rules a mandate.

In this week’s letter, the dealerships asked Biden to “hit the brakes” entirely, citing several factors that they say indicate slowing EV adoption. The signers said the supply of EVs on dealer lots is twice that of internal combustion engine vehicles, and that they won’t be able to sell EVs at the rate the regulations would require.

“It is uncontestable that the combination of fewer tax incentives, a woefully inadequate charging infrastructure, and insufficient consumer demand makes the proposed electric vehicle mandate completely unrealistic,” the letter says.

The EPA’s tailpipe-pollution limits wouldn’t require automakers to sell a specific number of EVs every year.

Automakers can meet EPA regulations not just through pure-electric vehicle sales, but also through a sales mix including hybrid and plug-in hybrid electric vehicles, plus cleaner internal-combustion engine vehicles. The EPA has also said that the auto industry could employ widespread use of particulate filters, which mitigate the soot emitted from conventional gasoline-fueled engines.

“In order to stay on track to meeting overall climate policy goals that have been adopted by the country, I think it’s important to be aggressive in this sector where you have the technology, progress is being made, there’s momentum in markets,” said Jessika Trancik, a professor in energy studies at the Massachusetts Institute of Technology. “This can be a really important part of the overall effort to reach 2030 and ultimately, 2050 emissions reduction targets.

“There are a number of different ways you can improve efficiencies and reduce emissions,” Trancik added. But, “If you want to meet those targets, fully electric vehicles are probably going to be a really important tool, at least in part, to allow for that because they do offer the greatest emissions cuts.”

The EPA is also proposing regulations for medium- and heavy-duty trucks, and the government’s National Highway Traffic Safety Administration has separately proposed a fuel-economy increase.