From Think Progress:

Now, Secretary of Defense Donald Rumsfeld has introduced a new rationale for the invasion of Iraq, high gas prices. From a radio interview last week:

SECRETARY RUMSFELD: The fact of the matter is - if Saddam Hussein were still in power in Iraq, he would be rolling in petrol dollars. Think of the price of oil today. He would have so much money. And he would be seeing the Iranians interested in a nuclear program, he would be seeing the North Koreans developing a nuclear program, and he’d say well why shouldn’t he - and he would. So we’re fortunate that he’s gone.

Of course, one of the reason gas prices are high is instability in the Middle East — created, in part, by the invasion of Iraq.