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If Trump's tariffs are illegal, Costco wants a refund. The lawsuits that brought President Trump’s tariffs before the Supreme Court last month were led by small businesses and Democratic state attorneys general, but now it’s bigger companies — including Costco — that are suing to make sure they’re in line for a refund if tariffs are struck down. Plus, "Marketplace Morning Report" is heading to the moon this week for views on an emerging lunar economy.