Nearly 2 million undocumented immigrants are the backbone of some industries, and they pay billions in taxes for services they never receive.

The Trump administration's plan to use active-duty U.S. military personnel to help with the mass deportation of undocumented migrants appears to be similar to the support role that troops provided along the U.

The president-elect said he will focus on deporting undocumented immigrants with a criminal past. But experts expect the administration to target others as well.