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A monitor displays Exxon Mobil Corp. signage on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Monday, Jan. 23, 2017. U.S. stocks fell as losses in energy and industrial shares offset gains in defensive industries, as investors weighed a tweet from President Donald Trump mentioning a 'very major' border tax. Photographer: Michael Nagle/Bloomberg via Getty Images

A monitor displays Exxon Mobil Corp. signage on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Monday, Jan. 23, 2017. U.S. stocks fell as losses in energy and industrial shares offset gains in defensive industries, as investors weighed a tweet from President Donald Trump mentioning a 'very major' border tax. Photographer: Michael Nagle/Bloomberg via Getty Images

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Traders work on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Friday, April 29, 2016. U.S. stocks slipped for a second day, after the Standard & Poor's 500 Index fell the most in three weeks, amid lackluster earnings and few signs of a pickup in economic growth. Photographer: Michael Nagle/Bloomberg via Getty Images

Traders work on the floor of the New York Stock Exchange (NYSE) in New York, U.S., on Friday, April 29, 2016. U.S. stocks slipped for a second day, after the Standard & Poor's 500 Index fell the most in three weeks, amid lackluster earnings and few signs of a pickup in economic growth. Photographer: Michael Nagle/Bloomberg via Getty Images