U.S. indexes were on track to open lower on Monday after President Donald Trump's renewed attacks on Federal Reserve Chair Jerome Powell sparked concerns about the central bank's independence and rattled investors grappling with an escalating trade war.

The U.S.-China trade war and President Donald Trump's attacks on Federal Reserve Chair Jerome Powell put the market on edge Monday. The Cboe Volatility Index, a widely-followed Wall Street fear gauge that tracks S&P 500 options contracts and trades under the ticker VIX,

U.S. stocks are falling as investors worldwide pull away from the U.S. because of uncertainty caused by President Donald Trump’s trade war.