A day after the United States reached a trade deal that imposes a 15 percent tariff on imports from Japan, President Donald Trump declared that U.S. business would “BOOM.” But early reads from auto analysts paint a murkier picture — if anything, some experts say, Japanese companies may benefit more than their rivals for now.

U.S. automakers worry that President Donald Trump's agreement to tariff Japanese vehicles at 15% would put them at a competitive disadvantage, saying they will face steeper import taxes on steel, aluminum and parts than their competitors.

Asian shares have rallied, with Tokyo's benchmark Nikkei 225 index up more than 3% after Japan and the U.S. announced a deal on President Donald Trump's tariffs