President Donald Trump is likely to dust off a 1930 trade law largely forgotten for decades to back his new reciprocal U.S. tariffs that will match other countries' higher import taxes, trade and legal experts say.

President Trump has announced reciprocal tariffs targeting countries like China and India, among others. The move challenges WTO principles and has sparked discussions on potential retaliatory measures.

Trump signed a memo that instructed staff to develop custom tariffs for each country, taking into account features such as their existing tariffs, exchange rates, trade balances and other rules. In outlining its concerns,