Investors are weighing Trump's pledge on Sunday to introduce additional 25% tariffs on steel and aluminum from all countries.

U.S. stocks slumped Friday as worries flared again on Wall Street about tariffs and inflation. The S&P 500 fell 0.9% and erased what had been a modest gain for the week. It’s one of the worse drops for the index so far in the young year,

U.S. stocks are slumping Friday amid worries about higher inflation and tariffs, while a closely watched report gave a mixed picture of the U.S. job market. The S&P 500 was down 0.9% and on track to wipe out what had been a modest gain for the week,

The S&P 500 ( ^GSPC) moved almost 1% lower, while the tech-heavy Nasdaq Composite ( ^IXIC) slid around 1.4%, both finishing their second week of consecutive losses. The Dow Jones Industrial Average ( ^DJI) also fell more than 400 points, or almost 1%, to register its worst daily performance in roughly four weeks.

U.S. stocks slumped Friday amid worries about higher inflation and tariffs, while a closely watched report gave a mixed picture of the U.S. job market. The S&P 500 was down almost 1%, and the Dow Jones Industrial Average fell more than 400 points,