Trump is at the top of the chain of command. Sessions works for him. If Trump wants Mueller gone then he should order Sessions to fire him. If Sessions refuses, then fire Sessions and everyone else in the Justice Department chain of command until he finds someone who will.
I think scorched earth is actually the best idea. Trump knows the toothless multitudes would support him.
[If Trump wants Mueller gone then he should order Sessions to fire him]
I think that was the jist of his tweet...
We get that, and got it over a year ago. Trump is deliberately not firing Sessions in order to eliminate any hint of alleged improprieties by ankle-biting Democrats and Never Trumpers.