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NASHVILLE, TN - MARCH 15: President Donald Trump speaks at a rally on March 15, 2017 in Nashville, Tennessee. During his speech Trump promised to repeal and replace Obamacare and also criticized the decision by a federal judge in Hawaii that halted the latest version of the travel ban. (Photo by Andrea Morales/Getty Images)
NASHVILLE, TN - MARCH 15: President Donald Trump speaks at a rally on March 15, 2017 in Nashville, Tennessee. During his speech Trump promised to repeal and replace Obamacare and also criticized the decision by a federal judge in Hawaii that halted the latest version of the travel ban. (Photo by Andrea Morales/Getty Images)

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    The key question about Trump's travel ban

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The key question about Trump's travel ban

CNN Legal Analyst Laura Coates explains why the question over the validity of President Trump's campaign pledge to create a Muslim ban is at the crux of the court deliberations over the legality of the executive action.

The key question about Trump's travel ban

CNN Legal Analyst Laura Coates explains why the question over the validity of President Trump's campaign pledge to create a Muslim ban is at the crux of the court deliberations over the legality of the executive action.