Acting Defense Secretary Chris Miller ordered a Pentagon-wide halt to cooperation with the transition of President-elect Biden, shocking officials across the Defense Department, senior administration officials tell Axios. Behind the scenes: A top Biden official was unaware of the directive. Administration officials left open the possibility cooperation would resume after a holiday pause. The officials were unsure what prompted Miller's action, or whether President Trump approved. Why it matters: Miller's move, which stunned officials throughout the Pentagon, was the biggest eruption yet of animus and mistrust toward the Biden team from the top level of the Trump administration. What happened:...