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DALLAS, TX - JANUARY 28: Protesters gather to denounce President Donald Trump's executive order that bans certain immigration, at Dallas-Fort Worth International Airport on January 28, 2017 in Dallas, Texas. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by G. Morty Ortega/Getty Images)
DALLAS, TX - JANUARY 28: Protesters gather to denounce President Donald Trump's executive order that bans certain immigration, at Dallas-Fort Worth International Airport on January 28, 2017 in Dallas, Texas. President Trump signed the controversial executive order that halted refugees and residents from predominantly Muslim countries from entering the United States. (Photo by G. Morty Ortega/Getty Images)

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Is Trump's travel ban legal?

A constitutional law expert explains the legal arguments for and against Trump's travel ban.

Is Trump's travel ban legal?

A constitutional law expert explains the legal arguments for and against Trump's travel ban.