In a series of tweets, Trump vowed his move - which threatens to end decades of California autonomy under Republican and Democratic presidents - would make cars "substantially SAFER" and that if he didn't act, automakers "will be out of business". Officials plan to also issue a separate rule to roll back Obama-era fuel efficiency standards.
Under Trump's plan, the Environmental Protection Agency will revoke the so-called waiver underpinning the state's ability to set tailpipe greenhouse-gas emissions standards that are more stringent, as well as the state's electric vehicle sales mandate.
But in a statement released Wednesday, Healey said "the Trump Administration's attack on the California waiver is an illegal assault on states' rights, clean air, and the climate that will cost drivers billions more at the pump".
President Donald Trump on Wednesday barred California from setting its own vehicle emissions standards, kicking off a battle that is likely to last well beyond the 2020 presidential election.
It's a critical fight for the world, because every auto maker selling to the United States has been meeting California's low-pollution standards, which has made America's overall vehicle emissions much lower than they would otherwise be. A dozen states and the District of Columbia furthermore apply California's fuel economy requirements.
"We will never be a socialist country", Trump said, according to Greig. Becerra said in California, transportation use accounts for 29 per cent of the greenhouse gas total.
That same month, the Environmental Protection Agency (EPA) said it would end rules limiting carbon emissions on new coal plants, soon after the president dismissed a report by his own government warning of future devastating economic consequences to the U.S. from climate change. He said Trump's decision had little to do with protecting the vehicle manufacturers and the economy, and was rather a defense of the oil industry. To address the problem, state officials developed environmental regulations that were more conservation-minded than the national ones set by the federal government, particularly when it came to limiting emissions from cars.
Mr. Trump is in California this week for a fundraising trip that includes GOP fundraising events near San Francisco, Los Angeles and San Diego.
USA automakers contend that without a substantial increase in fuel efficiency, their vehicles will be less competitive globally, which could potentially result in job losses.
But the head of the EPA, Andrew Wheeler, said in a speech yesterday, quote, "federalism does not mean that one state can dictate standards for the nation".
"This is the fight of a lifetime for us", said Mary Nichols, a senior air quality regulator in California, at a press conference with California's governor and attorney general in Sacramento on Wednesday. "There will be very little difference in emissions between the California Standard and the new U.S. Standard, but the cars will be far safer and much less expensive". "He asked about various things going on in California, [notably] the homelessness issue and how concerned he is about the health crisis, in Southern California in particular", said Dhillon, a San Francisco attorney whom Trump has recognized at the White House for her work on behalf of conservatives on college campuses and in Silicon Valley.
In July, four automakers signed a deal with California, agreeing to produce passenger vehicles averaging 50 mpg by 2026. Emissions standards are closely linked with fuel economy requirements because vehicles pollute less if they burn fewer gallons of fuel. Predictable emissions and fuel economy standards are vital for automakers because as they plan production and model offerings several years in the future.
However, his claims have been challenged by both United States vehicle makers and climate change activists.
On Wednesday, the two sides went to war over who should set USA standards for vehicle emissions and electric cars, the first feint in what could be a long legal battle.