President Trump, with DHS Secretary Kirstjen Nielsen, left, and Vice President Pence, right, prepares to sign an executive order ending the practice of separating migrant families. But the move leaves many questions unanswered.

President Trump, with DHS Secretary Kirstjen Nielsen, left, and Vice President Pence, right, prepares to sign an executive order ending the practice of separating migrant families. But the move leaves many questions unanswered.