The Trump administration is forcibly separating immigrant children from their parents, something they are hoping will deter immigrants from entering the country. It's sparked widespread outrage, protests and lawsuits, with the White House now attempting to distance itself from its own policy. How did we get here? Lee Gelernt has worked on immigrants right’s issues with the ACLU since 1992 and is now the lead lawyer suing the Trump administration to stop taking kids away from their parents. In this episode, Gelernt explains how immigration and national security became so conflated, how it connects to 9/11, and describes the trauma these families are going through. Read the full transcript at NBCNews.com/WhyIsThisHappening.