Mr. Ishiba

President Trump’s unexpected plan to impose a 25 percent tariff on cars and car parts imported into the United States will not only disrupt supply chains. It will also fuel anger and alienation — and pressure to retaliate — among American allies across the globe. Many of the countries most affected by the new levies, such as South Korea, Japan, Germany, Mexico and Canada, are already reeling from the Trump team’s disregard for free trade deals already signed and his threats to long-established