According to sources, while Trump had been growing displeased with Bolton's belligerent recommendations and overall demeanor (recall "Bolton 'Deep in His Heart' Believes Trump Is a 'Moron,' Former Aide Claims"), the tipping point happened when Bolton expressed his displeasure with Trump's impromptu invitation of the Taliban to Camp David on the week of the Sept 11 anniversary, a peace overture which as we reported over the weekend, collapsed in the last moment.

As with every Trump personnel decision, this one too appears not to have gone off without a hitch, and minutes after Trump's announcment, Bolton tweeted that "I offered to resign last night and President Trump said, "Let's talk about it tomorrow."