On the 4th (local time), the White House said it “remains optimistic that the Supreme Court will make the right ruling” a day before the Supreme Court’s review of the Trump administration’s tariff policy.

At a briefing that day, White House Press Secretary Caroline Leavitt said, “We are 100% confident in the legal arguments presented by the President and his team.”

On the 5th, the Supreme Court is scheduled to hold oral arguments to determine whether there is a legal basis for the reciprocal tariffs and other measures that President Trump imposed on countries around the world. President Trump has argued for the lawfulness of imposing tariffs under the International Emergency Economic Powers Act (IEEPA).

Leavitt said, “The President must have emergency authority to use tariffs,” asserting that President Trump, through the leverage of tariffs, concluded peace agreements and ended conflicts in various parts of the world and attracted investments worth trillions of dollars to the United States.

In response to the question, ‘If the Supreme Court hands down a ruling unfavorable to the Trump administration, is there a Plan B (alternative)?’, she answered, “The White House always has a Plan B.”

Even if the Supreme Court rules that imposing reciprocal tariffs based on the International Emergency Economic Powers Act is unlawful, observers have suggested that President Trump could continue to impose tariffs by invoking Section 232 of the Trade Expansion Act or Section 301 of the Trade Act, among other tools.

Section 232 of the Trade Expansion Act grants the President the authority to restrict imports of items that negatively affect national security, which would allow President Trump to substantially increase item-specific tariffs. Section 301 of the Trade Act, as a tool for responding to unfair foreign trade practices, can also serve as a basis for imposing tariffs.

Meanwhile, Leavitt reaffirmed President Trump’s position that Nvidia’s cutting-edge artificial intelligence (AI) semiconductor Blackwell will not be sold to China, stating, “In the case of Blackwell chips, for now we do not intend to sell them to China.”

Earlier, regarding whether Blackwell would be supplied to China or other countries, President Trump said, “The newly released Blackwell is ten years ahead of all other semiconductors,” adding, “We will not give it to other people (countries).”