Security:
America must have a strong national defense. The U.S.A. is a sovereign nation and should never subvert its national interests to those of another country, the United Nations, or any other entity.
Finally, in the last few decades, Militant Islamists have repeatedly attacked Americans and American interests here and abroad. Negotiating with terrorist makes them view us, in their own words, as a Paper Tiger and only further emboldens them and gives them more time to plan more attacks against us or in the case of Iran to further complete their nuclear weapon arsenal. The terrorists must be stopped and destroyed.