The order, which would use state and local officers, among others, would represent an enormous expansion of immigration enforcement. But it is unclear how it would be paid for.

Donald Trump has ordered the Department of Homeland Security to add at least 20,000 officers to enforce his deportation policies. The directive was issued on Friday and forms part of the administration's plan to incentive undocumented immigrants to self-deport.

Immigrants in the United States illegally are being told to voluntarily self-deport "or remain and face the consequences," President Donald Trump warned in a new executive order.