"Our response involves far more than instant retaliation and isolated strikes. Americans should not expect one battle, but a lengthy campaign, unlike any other we have ever seen. It may include dramatic strikes, visible on TV, and covert operations, secret even in success. We will starve terrorists of funding, turn them one against another, drive them from place to place, until there is no refuge or no rest. And we will pursue nations that provide aid or safe haven to terrorism. Every nation, in every region, now has a decision to make. Either you are with us, or you are with the terrorists. From this day forward, any nation that continues to harbor or support terrorism will be regarded by the United States as a hostile regime."
The official White House site on which the entire 40-minute speech is archived is: http://www.whitehouse.gov/news/releases/2001/09/20010920-8.html
And the 4-second video clip of Bush saying just "Either you are with us, or you are with the terrorists" can be viewed at: http://www.youtube.com/watch?v=cpPABLW6F_A
"Great tragedy has come to us, and we are meeting it with the best that is in our country, with courage and concern for others. Because this is America. This is who we are. This is what our enemies hate and have attacked. And this is why we will prevail."
The official White House site on which the entire radio address is archived is: http://www.whitehouse.gov/news/releases/2001/09/20010915.html