The day before a US Supreme Court showdown over President Donald Trump’s global tariffs, yet another lawsuit contesting his trade policies hit the docket.

The timing was unusual, since it’s unlikely a judge would do anything until after the high court rules.

But a lawyer in the case said there’s a reason he brought it now, and pitched it as a class action: If the administration loses before the justices, it could give a boost to a wider swath of companies angling to recoup higher levies that Trump imposed under the International Emergency Economic Powers Act.

“We want to make sure all of the IEEPA tariffs are dead everywhere for everybody,” said John Vecchione, a lawyer with the New Civil Liberties Alliance, which sued on behalf of a board game company, a champagne importer and a mannequin manufacturer.

The complaint seeks to certify a class of companies that imported products from China or the European Union, with high stakes for potential refunds. The administration estimates the government will collect close to $500 billion in tariff revenue in the current fiscal year.