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 Donald Trump signed an order to put tariffs on U.S. neighbors Canada and Mexico, as well as China, starting Tuesday.