A Department of Homeland Security request for 21,000 National Guard troops to support "expansive interior immigration enforcement operations" includes a call for troops to search for unaccompanied children in some cases and transport them between states, three sources briefed on the plan tell NBC News.

Having National Guard troops perform such tasks, which are not explained in detail in the DHS request, has prompted concern among Democrats in Congress and some military and law enforcement officials.

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The tasks are laid out in a May 9th Request for Assistance from the Department of Homeland Security to the Pentagon. The document states that, “this represents the first formal request by U.S. Immigration and Customs

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