The Taliban has threatened to kill anyone who supports an opposition government.
Mullah mohammed Omar said such people would be considered traitors punishable by death.
He includes people who supports the return of the former king of Afghanistan Zahir Shah.
He made his speech on Kandahar's Radio Sharia.
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Earlier, Omar warned the former king will be killed if he returns from exile to lead a government.
Zahir Shah was ousted in a 1973 coup but has recently emerged as a potential leader of a post-Taliban coalition.
Bur Omar says the Taliban will fight on and go after Americans even it is overthrown.
PA