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Air Force One touches down at LAX. Photo: Gina Ferazzi/Los Angeles Times via Getty Images

President Trump today plans to revoke California’s landmark emissions standards, setting up another sweeping legal fight with the nation’s largest state that may echo beyond his presidency. 

Why it matters: Trump is at war with California over the environment, homelessness, tax returns, immigration and virtually every topic he touches. The courts are almost always center stage.

  • Gov. Gavin Newsom (D) — who earlier this year told "Axios on HBO" that Trump is helping turn the GOP into a dying, xenophobic party — accused the president of a "political vendetta" with his latest move. 

This could snuff out any hope automakers had of avoiding a bitter legal fight between the administration and California, Axios' Ben Geman writes.

  • "This will be the biggest fight in environmental law since the Clean Power Plan. Maybe bigger," tweeted Nathan Richardson of the University of South Carolina School of Law.

The backdrop: Trump, who spent the night in L.A., kicked off a Golden State moneymaking swing yesterday with a $3 million Bay Area luncheon, followed by a $5 million Beverly Hills dinner at the home of real estate developer Geoffrey Palmer, per AP.

  • Trump will bring in $7 million today with a breakfast in L.A. and luncheon in San Diego, before he visits the border wall.

The bottom line: The landscape on California issues would shift overnight if a Democrat wins the White House — but Trump rightly sees the state as unwinnable.

Go deeper: California plays by its own rules

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Go deeper

Facebook to lift political ad ban imposed after November election

Photo Illustration by Omar Marques/SOPA Images/LightRocket via Getty Images

Facebook will finally allow advertisers to resume running political and social issue ads in the U.S. on Thursday, according to a company update.

The big picture: Facebook and rival Google instituted political ad bans to slow the spread of misinformation and curb confusion around the presidential election and its aftermath.

Bryan Walsh, author of Future
24 mins ago - Technology

AI is industrializing

Illustration: Sarah Grillo/Axios

Artificial intelligence is becoming a true industry, with all the pluses and minuses that entails, according to a sweeping new report.

Why it matters: AI is now in nearly every area of business, with the pandemic pushing even more investment in drug design and medicine. But as the technology matures, challenges around ethics and diversity grow.

Updated 1 hour ago - Politics & Policy

National Guard chief: Pentagon's "unusual" Jan. 6 restrictions led to 3-hour delay

William Walker, commanding general of the D.C. National Guard, testified Wednesday that a three-hour delay in approval for National Guard assistance during the Jan. 6 Capitol attack was exacerbated by "unusual" restrictions on his authorities by Pentagon leadership.

Why it matters: Walker testified that if Army Secretary Ryan McCarthy had not prohibited him in a Jan. 5 memo from using the National Guard's "Quick Reaction Force" without authorization, he would have "immediately" sent troops to the Capitol after receiving a "frantic call" from then-Capitol Police Chief Steven Sund.