President Donald Trump ’s latest tariff moves drew worries from Wall Street as stocks slumped Friday and Treasury yields fell sharply. Trump signed an order the previous night imposing steep tariffs on 66 countries,

U .S. stocks closed markedly lower on Friday, a day after President Donald Trump signed an executive order slapping new tariffs on dozens of countries. A weak jobs report worsened investor jitters, revealing a slowdown of hiring over recent months as Trump's previous tariffs took hold.

But there is a non-statistical basis for concern: an ominous parallel with the financial environment that prevailed in the weeks leading up to the October 1987 stock-market crash. On that day — Black Monday — the Dow Jones Industrial Average dropped 22.6% in a single session.