The 11-page document calls for the unprecedented militarization of immigration enforcement as far north as Portland, Oregon, and as far east as New Orleans, Louisiana.
Four states that border on Mexico are included in the proposal -- California, Arizona, New Mexico and Texas -- but it also encompasses seven states contiguous to those four -- Oregon, Nevada, Utah, Colorado, Oklahoma, Arkansas and Louisiana.
Governors in the 11 states would have a choice whether to have their guard troops participate, according to the memo, written by US Homeland Security Secretary John Kelly, a retired four-star Marine general.
While National Guard personnel have been used to assist with immigration-related missions on the US-Mexico border before, they have never been used as broadly or as far north.
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The memo is addressed to the then-acting heads of US Immigration and Customs Enforcement and US Customs and Border Protection. It would serve as guidance to implement the wide-ranging executive order on immigration and border security that President Donald Trump signed January 25. Such memos are routinely issued to supplement executive orders.
It describes how the troops would be activated under a revived state-federal partnership program, and states that personnel would be authorized to conduct searches and identify and arrest any unauthorized immigrants.
Requests to the White House and the Department of Homeland Security for comment and a status report on the proposal were not answered.
The draft document has circulated among DHS staff over the last two weeks. As recently as today, staffers in several different offices reported discussions were underway.
Use of National Guard troops would greatly increase the number of immigrants targeted in one of Trump's executive orders last month, which expanded the definition of who could be considered a criminal and therefore a potential target for deportation.
That order also allows immigration agents to prioritize removing anyone who has "committed acts that constitute a chargeable criminal offense.