The Short Version
The claim is misleading. On February 20, 2026, the Supreme Court struck down Trump's tariffs imposed under IEEPA — but the new tariffs he announced shortly after were imposed under a completely different legal authority (Section 122 of the Trade Act), which the Court never invalidated. Saying the Court "struck down his authority to do so" falsely implies he acted in defiance of the ruling. Additionally, while Trump signed the new order the same day, the tariffs didn't take effect until days later, making "immediately imposed" an overstatement.