Bolton seems to left to twist in the wind, which is exactly how an adminstration signals to an appointee that the time for come for a graceful exit

The Washington Note Archives: "White House Silence: Bolton's Nomination Just Withering Away. . .
I have spent much of the day trying to learn what, if anything, came from an alleged strategy session between White House top brass and State Department legislative strategists on the nomination of John Bolton to serve as U.S. Ambassador to the United Nations.
There is no news. Absolute silence. Everyone is guessing now that what air was left in the effort to get Bolton to Turtle Bay is dissipating rapidly."