President Donald Trump is used to battles at the Supreme Court against liberal advocacy groups, but Wednesday’s high-stakes argument over his tariff policy features a very different foe — a legal center funded without public disclosure by some of the country’s wealthiest conservatives.

The cases on which the Supreme Court is scheduled to hear oral arguments were brought by small businesses, which argue that Trump’s tariffs have harmed them by raising their costs. Standing behind them, however — and paying for some of the high-priced legal talent — is the Liberty Justice Center, a nonprofit group with a libertarian-leaning agenda that has previously challenged public-sector unions and sued to prevent the ban on TikTok from taking effect.

Liberty Justice Center does not disclose the names

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