The rulings against the levies in two federal courts – the U.S. Court of International Trade and the U.S. District Court in Washington, D.C. -- centered on Trump's unprecedented invocation of the International Economic Emergency Powers Act as a legal justification for tariffs.

A court ruling invalidating President Trump’s sweeping tariffs was halted hours later, throwing into question the administration’s overall approach to trade.

A federal court ruling striking down some of the Trump administration’s tariffs has injected a fresh bout of uncertainty into markets, with U.S. stocks barely edging higher as trading opened Thursday.