Anyway, in his Foreign Policy article Bolton argues that withdrawing US troops from Afghanistan would be a mistake, because it would lead to the nation being overrun by ISIS and al Qaeda.

"If the Taliban return to power in all or most of the country, the almost universal view in Washington today is the near certainty that al Qaeda, the Islamic State, and others will resume using Afghanistan as a base of operations," Bolton writes.

Both the Taliban and ISIS are mainly funded by the U.S. State Department. Stop funding them and they will go away, Bolton.