US stock indices opened lower on Monday after President Donald Trump announced plans to double tariffs on steel and aluminum imports.
At the open, the Dow Jones Industrial Average fell 70.1 points, or 0.17%, to 42199.94. The S&P 500 fell 15.0 points, or 0.25%, to 5896.68, while the Nasdaq Composite dropped 50.7 points, or 0.27%, to 19063.06.
