States have already taken action in light of the ruling.
GM and Ford included expected tariff refunds in their first-quarter earnings results.
All flights have been canceled as Spirit halts operations, bringing a major U.S. budget airline to a sudden end after months of restructuring.
The president said an announcement on the result could come soon.

The FBI is investigating the death of a truck driver whose body and semitrailer were found in different areas of southeastern Georgia.
The legislature will have an opportunity to overturn the veto.
Market volatility dropped sharply.
It’s part of a series of actions by the Trump administration aiming to prevent illegal immigrants from obtaining taxpayer benefits or preferential treatment.
Abbas Ali Haider faces up to 10 years in federal prison for taking $40,000 each from Pakistani people to help them illegally cross the U.S. southern border.

The Justice Department issued the subpoena last July, but the hospital had not complied.
As of March 31, the company’s individual exchange business had 369,000 members in individual and family plans.
A glimpse into the world through the lens of photography.
A statement from Iranian leader Mojtaba Khamenei indicated the country is developing ‘new rules’ to assert control over the Strait of Hormuz.
The U.S. District Court in Massachusetts granted a preliminary injunction, requiring U.S. Citizenship and Immigration Services to lift adjudicative holds.
A total of $350 million in Medicaid dollars that Minnesota expected has now been frozen, administrator Dr. Mehmet Oz said.
‘People have wanted to do this for a long time,’ President Donald Trump said in a social media post.
Since taking office, President Donald Trump has prioritized lowering the number of border crossings in a bid to tamp down illegal immigration.
The findings came after a former government employee was charged with plotting to destroy records.
Iran’s hold on the waterway causes international pain while U.S. Navy’s worldwide hunt for ’shadow fleet' tankers is aimed only at Iran.
The royal couple visited the waterfall pools located where the World Trade Center’s twin towers once stood.
Friedrich Merz had earlier said that the United States had been ‘humiliated’ by Tehran after U.S. officials agreed to travel to Pakistan for peace talks.