Mass migrations of people are a huge risk factor for human rights catastrophe. The Armenian genocide started as a mass deportation.

Once you're seriously talking about uprooting millions of people, including breaking up families that have lived in the United States for decades, you create a destabilizing set of conditions you may not be able to control.

Those people need to be housed, fed, moved, put on planes or ships to wherever they're being sent. The potential for abuse and tragedy is there at every step in this process.