War with Tehran has strained US munitions reserves including critical interceptor missiles

"I hereby find that conditions exist which may pose a direct threat to the national defense or its preparedness programs," Trump said in a June 11 memorandum to the Pentagon chief.

Trump invokes the Defense Production Act to boost US munitions output, waive regulations on critical minerals, and hold defense contractors accountable.

President Donald Trump recently invoked the Defense Production Act as a means to bolster the country's critical munitions and supply lines.