What may be the biggest battle yet in Donald Trump's trade war is about to begin.

The Trump administration heads to the US Supreme Court on Wednesday, facing off against small businesses and a group of states who contest the legality of most of the tariffs it has implemented.

If the court agrees with the challengers, it would overturn Trump's expansive trade strategy, potentially leading to refunds of billions collected from tariffs that act as taxes on imports.

Legal experts suggest that the Court’s decision could take several months after they deliberate on arguments from both sides.

Trump has warned that a loss would greatly constrain his trade authority and could jeopardize national security. His remarks amplify the high stakes involved for the U.S. economy and international trade relations.

Notably, Learning Resources, a toy company affected by the tariffs, has forecasted a $14 million loss this year due to these tariffs, illustrating the broad impact on American businesses.

In addition to the economic implications, the Supreme Court’s decision will also test the limits of presidential powers concerning tariff imposition, as the case hinges on the IEEPA of 1977, which allows for expedited processes under a declared national emergency.

Opponents of the tariffs argue that using this act for tariff implementation violates constitutional provisions that reserve tax powers for Congress.

Over 200 members of Congress have advocated against these tariffs, asserting their constitutional right to regulate trade, leading to a bipartisan opposition.

As the justices prepare to review this contentious issue, the implications reach beyond U.S. borders, affecting international trade agreements and negotiations as countries await the Supreme Court’s ruling.

The upcoming deliberations may take a toll on ongoing trade discussions, such as those with the European Union, thereby reshaping not just current practices but also setting standards for future presidential actions.

With both economic and political ramifications hanging in the balance, this Supreme Court case represents a critical juncture in the ongoing saga of Trump's tariff policies.