California Attorney General Rob Bonta and Governor Gavin Newsom today filed an amicus brief in the U.S. Supreme Court in Learning Resources Inc. v. Trump, opposing the Trump Administration’s persistent efforts to impose illegal tariffs that have sent shockwaves and uncertainty through global economies, markets, and consumers. In the brief, Attorney General Bonta argues that the International Emergency Economic Powers Act (IEEPA), which the President has used as a vehicle to levy the tariffs in question, does not delegate any authority to the President to impose tariffs. Learning Resources Inc. v. Trump is scheduled for oral argument before the Supreme Court on Wednesday, November 5, 2025. President Trump’s illegal tariffs are causing uncertainty and unpredictability, which is bad for business, bad for the economy, and as the fourth largest economy in the world, bad for California. In April, Attorney General Bonta and Governor Newsom filed a lawsuit challenging President Trump’s unlawful use of power to impose tariffs without the consent of Congress.

“President Trump’s illegal tariffs impact businesses, consumers, and states across the nation — and they are illegal. Any attempt by the Trump Administration to interpret IEEPA as giving it the power to impose tariffs is a feat of mental gymnastics,” said Attorney General Rob Bonta. “No matter how you spin it, no matter what definitions the Administration reaches for, 2 + 2 does not equal 10. Congress does not hide elephants in mouseholes — if Congress had intended to grant the President such extraordinary authority, it would have said so. Today, California asks the U.S. Supreme Court to rule that IEEPA does not authorize the President to impose tariffs.”