From an interview with Amy Goodman of Democracy Now!:

I knew why, because I had been through the Pentagon right after 9/11. About ten days after 9/11, I went through the Pentagon and I saw Secretary Rumsfeld and Deputy Secretary Wolfowitz. I went downstairs just to say hello to some of the people on the Joint Staff who used to work for me, and one of the generals called me in. He said, ?Sir, you?ve got to come in and talk to me a second.? I said, ?Well, you?re too busy.? He said, ?No, no.? He says, ?We?ve made the decision we?re going to war with Iraq.? This was on or about the 20th of September. I said, ?We?re going to war with Iraq? Why?? He said, ?I don?t know.? He said, ?I guess they don?t know what else to do.? So I said, ?Well, did they find some information connecting Saddam to al-Qaeda?? He said, ?No, no.? He says, ?There?s nothing new that way. They just made the decision to go to war with Iraq.? He said, ?I guess it?s like we don?t know what to do about terrorists, but we?ve got a good military and we can take down governments.? And he said, ?I guess if the only tool you have is a hammer, every problem has to look like a nail.?

So to be fair, it was some other general – but Clark put it out there. Perfect analogy.