The Obama administration set the standards in 2012, calling for the average miles-per-gallon for cars to increase to 41.7 in 2020 models and to 54.5 in 2025 models.
President Donald Trump's proposal also undercuts California's authority to set its own stricter emissions rules for the state.
"Freezing or weakening these standards puts the health of our children, seniors, and all communities at risk, and increases the rising costs of climate change for our states", a joint statement said.
The 19 states, and Washington D.C., announced they would sue to halt the proposed rollback, touching off what will likely be a heated legal showdown, possibly making it to the Supreme Court.
Becerra said he was already preparing to sue the Trump administration and would be joined by 18 other state attorneys general, including Pennsylvania, Massachusetts, and NY.
Massachusetts Attorney General Maura Healey speaks at the 2018 Massachusetts Democratic Party Convention, Friday, June 1, 2018.
The agency suggests keeping the Obama-era standards would add $2,340 to the cost of owning a new auto, "and impose more than $500 billion in societal costs" on the USA economy over the next 50 years. The standards, enacted in 2012, get stricter every year leading up to 2025. Bill Wehrum, an assistant EPA administrator, told reporters on Thursday that many things had changed, including a drop in fuel prices, since the efficiency rules were last set six years ago. "More realistic standards will promote a healthy economy by bringing newer, safer, cleaner and more fuel-efficient vehicles to USA roads and we look forward to receiving input from the public".
Easing requirements that cars be more fuel efficient should make them both cheaper and safer, getting vehicles with the latest safety developments in the hands of consumers, officials said. The company went on to say the "proposal includes a range of options, and we will carefully evaluate how each aligns with FCA's goals of continuous improvement in vehicle efficiency". The rule says there would not be an increase in smog, but the Union of Concerned Scientists said the amount of additional pollution would be equivalent to greenhouse gas emissions from 43 coal-fired power plants.
Former Gov. Arnold Schwarzenegger, a Republican, was just as critical. "We have been steadily increasing the standards... for nearly a decade", said EPA Assistant Administrator Bill Wehrum on a call with reporters Thursday.
Representatives of the US auto industry praised the administration's proposal, even as some automakers privately have expressed unease at the prospect of abrupt changes in fuel standards and having to meet different standards in different states.
"This has to be absolutely one of the most harmful and dumbest actions that the EPA has taken", said Healey of MA, one of the attorneys general from 19 states and the District of Columbia objecting to the change.
The administration must gather feedback on the proposal before it is finalized, a process that could take months and that could be further delayed by lawsuits.
And that will likely mean far less funding for Trump's proposed border wall than he initially sought, analysts said . Attorney General Jeff Sessions and DHS' Nielsen implemented the policy in earnest in May. "We'd get blamed", Sen.
U.S. spy satellites have detected renewed activity at a North Korean nuclear missile factory, according to a senior U.S. official. Indeed, the commitments regarding its nuclear weapons program were so vague as to be nearly meaningless, in my view.
In March, astronaut Eric Boe visited Space Launch Complex 41 (SLC-41) at Cape Canaveral Air Force Station in Florida. SpaceXNASA astronaut Sunita "Suni" Williams tests mock-ups of SpaceX's Crew Dragon spaceship and spacesuit.
The teams still have plenty of time to ideal their designs: it could be decades before a manned mission to Mars takes place. ET today, don't worry; it will remain pretty close, providing great viewing opportunities until about the end of August.
But Asonye told jurors the evidence would show Manafort hid "tens of millions of overseas income" to avoid paying taxes. Rudy Giuliani, a lawyer for Trump, said no one facing trial should expect a pardon, but he did not rule one out.
The report casts further doubt on President Donald Trump's claims of victory last month in disarmament talks with North Korea. U.S. officials have not said if Pompeo will meet his North Korean counterpart, Ri Yong-ho, on the sidelines of the forum.
Police say three people have died and seven other people have been transported to local hospitals with gunshot wounds. New Orleans Police were still on the hunt for the suspected shooters on Sunday morning.
He said the 19 percent plunge in Facebook shares the next day stemmed from federal securities law violations by the defendants. Shareholders suddenly turned tail after realizing that growth had been running out of the company's core money-making app.
The remains will immediately be subjected to DNA testing to see if they match DNA in the DPAA's database. USA officials say they have already contacted the family of a service member whose dog tag was returned.
Secretary Pompeo and National Security Advisor John Bolton, in contrast, seem more interested in forcing Iran to capitulate. Iran is less isolated than North Korea and less amenable to a media spectacle that doesn't restore the benefits Iran lost.
England reach lunch with Cook the only casualty
That was when Sam Curren was thrown the ball and in the spate of eight deliveries the left-arm pace ace got three wickets . On Thursday, spectators once again witnessed India's batting order getting collapsed as Virat Kohli fought a lone battle.
Kansas firefighters head west to help battle wildfires
The fire was nearly 35 percent contained, and thousands of residents were allowed to return to their neighborhoods. As of last week, the state has spent a quarter of its annual emergency budget on battling the fires.
Trump says Koch brothers are ‘a total joke’ in GOP
This isn't the first time the Koch brothers have disagreed with Trump-in fact, they didn't financially back his 2016 campaign . But trade - and Trump's aggressive actions on tariffs - remain a sticking point for some of the Koch stalwarts.
Last-Minute Signings Jose Mourinho MUST Make
United travel to Germany for their final pre-season game against Bayern Munich at the Allianz Arena on Sunday. Jose Mourinho wants two more signings before the transfer deadline - but is only confident of getting one.
Muto set to make move to Newcastle
He then went on to play 24 times for Newcastle during last season, helping the side to a 10th-place finish. Aleksandar Mitrovic has left Newcastle's pre-season trip to Portugal after a fee was agreed with Fulham .