Trump put him in place as Defense Secretary to support his coup attempt:
President Donald Trump named him acting defense secretary on November 9, 2020, after firing Mark Esper. [5] [6] [7] [8] Miller, who took office soon after Trump's loss in the 2020 presidential election, was accused of obstructing the transition to Joe Biden's administration by Biden staff......Miller was also criticized for his response to the 2021 storming of the United States Capitol. He approved the deployment of National Guard troops from neighboring states to reinforce the D.C. National Guard at 4:41 p.m., three hours after Capitol Police said that they were being overrun and two hours after city officials had asked for such assistance. [.............According to Miller's later statements, on January 3 he was ordered by Trump to "do whatever was necessary to protect the demonstrators" on January 6. [43] The following day, Miller issued orders which prohibited deploying D.C. Guard members with weapons, helmets, body armor or riot control agents without his personal approval. [44] On January 5, Secretary of the Army Ryan McCarthy issued a memo placing limits on the District of Columbia National Guard. [44] Maj. Gen. William J. Walker, the commanding general of the D.C. National Guard, later explained: "All military commanders normally have immediate response authority to protect property, life, and in my case, federal functions — federal property and life. But in this instance I did not have that authority." [44]
Miller's actions on January 6 also faced scrutiny. [45] After rioters breached the Capitol Police perimeter, Miller waited more than three hours before authorizing the deployment of the National Guard. [46] [45] Miller didn't provide that permission until 4:32 pm, after assets from Virginia had already entered the District, and Trump had instructed rioters to "go home"
............
https://en.wikipedia.org/wiki/Christopher_C._Miller
|