The Pentagon has ordered about 1,500 active-duty soldiers to be ready in case of a possible deployment to Minnesota, where federal authorities have been conducting a massive immigration enforcement operation, two defence officials said Sunday. The officials, who spoke on condition of anonymity to discuss sensitive military plans, said two infantry battalions of the Army's 11th Airborne Division have been given prepare-to-deploy orders. The unit is based in Alaska and specializes in operating in arctic conditions. One defence official said the troops are standing by to deploy to Minnesota should President Donald Trump invoke the Insurrection Act, a rarely-used 19th century law that would allow him to employ active duty troops as law enforcement. The move comes just days after Trump threatened to do just that to quell protests against his administration's immigration crackdown. In an emailed statement, Pentagon chief spokesman Sean Parnell did not deny the orders were issued and said