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Billionaire Carlos Slim, chairman emeritus of America Movil SAB and Telefonos de Mexico SAB, speaks while holding up U.S. President Donald Trump's book during a news conference in Mexico City, Mexico, on Friday, Jan. 27, 2017. Slim spoke about the outlook for Mexico, investment strategy, U.S. President Donald Trump and U.S.-Mexican trade relations. Photographer: Susana Gonzalez/Bloomberg via Getty Images

Billionaire Carlos Slim, chairman emeritus of America Movil SAB and Telefonos de Mexico SAB, speaks while holding up U.S. President Donald Trump's book during a news conference in Mexico City, Mexico, on Friday, Jan. 27, 2017. Slim spoke about the outlook for Mexico, investment strategy, U.S. President Donald Trump and U.S.-Mexican trade relations. Photographer: Susana Gonzalez/Bloomberg via Getty Images