Washington, June 1 -- President Donald Trump's surprise threat to impose escalating tariffs on Mexican imports jolted industry leaders throughout the U.S. economy Friday, sparked opposition even from usual Trump allies and set the stage for American consumers to face higher prices.

It also sent stock markets tumbling, with the Dow Jones industrial average closing down roughly 355 points, or 1.4%. Investors poured money instead into the safety of bonds, sending yields lower and signaling that they fear the economy will slow in the coming months.

Trump vowed Thursday to slap a 5% tariff on all Mexican imports on June 10, just over a week away, and raise those tariffs to 25% by October, unless Mexico stops the flow of Central American migr...