Sessions's presence in the administration has been consolation for many upset by Trump's various deviations:
Trump promised to end the illegal DACA amnesty, but is expanding it instead? Well, at least Sessions is attorney general.
"Well, at least Judge Jeanine is attorney general" doesn't have quite the same ring. If Sessions does end up being forced out, the tolerance for Trump's policy aberrations evaporates. Trump needs Sessions more than Sessions needs Trump.