9/11 did happen before, as previously stated. In 1993. It will also happen again. The problem is not who was or is president but who WE ARE. We are the great satan as far as radical Islam is concerned and we support the little satan-Israel. And we are the most Christian practicing and believing nation on earth. We are wealthy compared to most Muslim countries and American culture has diffused into every corner of the earth. That fact alone scares them and engenders their hatred. But most of all we are non Muslim.
No Muslim can rest until all the world is Islamic. They may not all carry on an active jihad but none will do anything to stop their more radical brothers because they see jihad as a means to an end. They will ALL benefit, as Muslims, from the disintergration of the West, Christianity, Hinduism, Buddhism, etc. It is the mission of EVERY Muslim to convert all mankind to Islam. Preferablly by persuasion but by the sword is also mandated in the Koran. Europe will cease to exist as a non Muslim entity within 50 yrs. What you see in Saudi Arabia and Iran will be what you see in Europe. Western societies refuse to confront the jihadists at their gates because we refuse to believe that they really DO mean what they constantly espouse- death to America, death to Israel, death to Christians, death to Hindu's, etc. We are afraid to confront the killers for who and what they really are. They keep telling us but we refuse to listen.
I hope I do not live to see it but I can tell you that there will come a time that every "Christian" in Europe will be faced with the choice- convert to Islam or watch your whole family be slaughtered in front of your eyes. Westerners will convert because they value life , and their children, more than any belief. Most Westerners don't REALLY believe in anything, anyway. They mouth belief in God,etc but don't act or live like it.
It will not matter one iota who we elect in the future because regardless of what we do their mission will ALWAYS be the same- to destroy us.