U.S. stock-index futures opened sharply lower and oil prices jumped Sunday night and investors braced for volatility across financial markets after President Donald Trump over the weekend announced heavy tariffs on imports from Canada,

Oil prices jumped at the market open on Monday after U.S. President Donald Trump imposes tariffs on Canada, Mexico and China, raising fears of a trade war and disruption in crude supply from two of the United States' biggest suppliers.

President Trump said he would speak Monday morning with the leaders of Canada and Mexico after imposing a fresh round of tariffs on imports from those countries and made clear it would take