In an urgent phone call to the acting defense secretary, he issued a startling demand. “We must establish order,” said Gen. Mark Milley, chairman of the Joint Chiefs of Staff, in a call with Pentagon leaders. ADVERTISEMENTLawmakers, protected to this day by National Guard troops, will hear from the inspector general of the Capitol Police this coming week. According to the Pentagon’s plans, the acting defense secretary would only be notified if the crowd swelled beyond 20,000. There, they would prepare to head to the Capitol once Miller, the acting defense secretary, gave final approval.