since he has already used them against his own people, i think he will use everything he has against us, which will include banned chemical agents, and bio agents if he gets the chance. doubtful has nuclear weapons.
he will also attempt to destroy his own oil refineries.
i doubt he will be taken alive, or surrender or agree to go to another country to spare innocent lives.
but as his military strength is about half of what it was durning desert storm, it will be over relatively soon. i hope.