The US Supreme Court is weighing the constitutionality of President Trump's tariffs, which he imposed by declaring a national emergency.
More than 1,000 companies have joined the case, seeking refunds from over $130 billion already collected.
The case challenges whether the executive branch overstepped its authority, as the Constitution grants Congress sole power to impose tariffs.
A decision could have far-reaching consequences for the balance of power between branches of government.
Al Jazeera's Mike Hanna reports from Washington, DC.
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