Major U.S. stock indexes are poised to open sharply lower on Monday after President Donald Trump over the weekend signed executive orders calling for tariffs to be imposed on Canada, Mexico and China.

Dow Jones futures plunged 650 points Monday on President Trump's tariffs on Canada, China and Mexico. Nvidia and Tesla dived.

Stock futures tumbled Sunday night to kick off a new trading month, as investors weighed new U.S. tariffs on goods from key ...