A police officer walks past people as they gather to protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 28, 2017.

A police officer walks past people as they gather to protest against the travel ban imposed by U.S. President Donald Trump's executive order, at Dallas/Fort Worth International Airport in Dallas, Texas, U.S. January 28, 2017.

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