U.S. equity futures tumbled in early Monday trading, while energy prices leaped and the dollar soared to a two-year high against its currency peers as markets reacted to the weekend tariff announcements of President Donald Trump and their potential to trigger a global trade war.

Asia shares are mostly declining as worries grow about President Donald Trump imposing tariffs on key U.S. trading partners

Stock market returns under presidential administrations are more correlation than causation, regardless of what political pundits say.