Explainer-What happens next in the US court battle over Trump's tariffs?

WASHINGTON (Reuters) -A federal appeals panel on Thursday appeared skeptical of U.S. President Donald Trump's argument that a 1977 law historically used for sanctioning enemies or freezing their assets gave him the power to impose tariffs. Regardless of how the court rules, the litigation is almost certainly headed to the U.S. Supreme Court. Here is what you need to know about the dispute, which Trump has called "America's big case," and how it is likely to play out in the months ahead.