US stocks opened lower Friday after President Trump hinted that there could be new tariffs imposed on China as a result of the Covid-19 outbreak. Trump said late Thursday that the trade deal with China is now "secondary to what took place with the virus" and made the unfounded claim that the novel coronavirus originated in a Chinese lab.
Stocks fell Thursday but still posted sizable gains in April. It was the best month for the Dow and S&P 500 since January 1987. Investors were also weighing uncertain outlooks from tech giants Apple (AAPL) and Amazon (AMZN) and weak results from oil titans Exxon Mobil (XOM) and Chevron (CVX).