According to Donald Trump, a group of several thousand Hondurans fleeing violence and poverty who are on foot and 1000 miles from the US border are a threat to US national security and sovereignty. Who is part of the "caravan"? Why have they left Honduras? What are their prospects for reaching the US border? What policy options--other than fear-mongering--does the US have? Doris Meissner, former US Commissioner of Immigration and currently a senior fellow at the Migration Policy Institutes, provides answers.