Wall Street is assessing President Trump''s tariff salvo on Apple and what his giant tax bill means for the deficit and the economy.

U.S. stock index futures slid on Friday after President Donald Trump recommended 50% tariffs on the European Union, while Apple stock dropped after he warned that the company would have to pay tariffs if its phones were not made in the United States.

After recovering from an initial jolt, U.S. stocks drifted through quiet trading following the latest reminder that the U.S government may be hurtling toward an unsustainable mountain of debt.

Stocks drifted to a mixed close on Wall Street in what has been a rocky week because of worries coming out of the bond market about the U.S. government's mounting debt.

U.S. stocks are gaining ground at the end of a wobbly day of trading in what has been a rocky week so far because of worries coming out of the