In a 6-3 ruling, justices upended the Trump administration’s signature economic policy, potentially putting the US government on the hook for at least $175 billion in tariff refunds.

Economists estimated more than $175 billion may need to be refunded.

Supreme Court Justice Brett Kavanaugh, in his dissent, warned that "the refund process" for tariffs "is likely to be a 'mess,' " citing oral arguments