Congress would play no role except to politically pressure Biden to refer charges.
Zackly. As Asterisk, as you pointed out, will not (yet) fire Milley, there is no federal entity left to pressure Asterisk to do anything but what he does currently with wild abandon -- threaten U.S. citizens, rule by fiat, and eat ice cream.
And as the above commentary laments, Congress is too busy with sound bites and playing with their collective peckers to do anything other than preen before the cameras.
In short, Milley walks -- for now. Maybe, after the 2022 elections (assuming that yet another election isn't rigged like 2020), the Repubs can get their shit together and stop playing grabass with idiots like Blinken.
But I doubt it.