President Donald Trump's use of sweeping tariffs faced sharp questioning at the Supreme Court on Wednesday, in a case with major implications for the president's agenda and the global economy.

A majority of justices, including several conservatives, expressed doubts about the White House's justification of the import duties, which the president has said are necessary to restore America's manufacturing base and fix its trade imbalance.

The measures are being challenged by a number of small businesses and a group of states, which contend that the president has overstepped his authority in imposing the levies, which are in effect a tax.

America's top court - which has a 6-3 conservative majority - usually takes months to reach big decisions, but many expect it to move faster in this case, which is also seen as the first major test of the Trump administration's push to expand presidential power.

Justice Amy Coney Barrett questioned the rationale for applying tariffs to a wide range of countries, asking, Is it your contention that every country needed to be tariffed because of threats to the defense and industrial base?

With billions of dollars in tariff payments hanging in the balance, a ruling against the administration could trigger the refund of substantial sums already collected, a situation Justice Barrett noted could lead to significant financial complications.

The White House has indicated a readiness to explore alternative tariff policies should the court rule against them. White House press secretary Karoline Leavitt affirmed this stance ahead of the hearing.

President Trump himself expressed confidence, indicating that losing the case would be devastating for the country and describing it as potentially one of the most important legal battles in U.S. history.

The legal debate centers on the powers granted by the International Emergency Economic Powers Act (IEEPA), with arguments suggesting that Trump's actions may exceed what was initially intended by Congress.

John Sauer, Solicitor General, defended the administration's position, arguing against potential domestic and international repercussions should the court curtail presidential authority in trade matters.

Chief Justice John Roberts highlighted concerns over the expansive implications of ruling in favor of such broad tariff powers for the presidency, reflecting the debate on Congressional authority over taxation and commerce.

Overall, the outcome of this high-stakes hearing could reshape the landscape of U.S. trade policy and the balance of presidential power.