From Jason Linkins 
QUESTIONER: "I have a great fear that say you're elected as the nominee of the party. Next August sometime during the summer, Dick Cheney and George are going to bomb Iran."
BIDEN: "Legitimate concern."
QUESTIONER: "What can you do about it?"
BIDEN: "I am not one, who if you've observed me for some time, I am not one who's engaged in excessive populist rhetoric. I'm not one that pits the rich against the poor. I'm not one who's gone out there and made false threats against presidents about, and god love him he's a great guy, I'm not Dennis Kucinich saying impeach everybody now. But let me tell you, I have written an extensive legal memorandum with the help of a group of legal scholars who are sort of a stable of people, the best-known constitutional scholars in America, because for 17 years I was chairman of the Judiciary Committee.
"I asked them to put together [for] me a draft, which I'm now literally riding between towns editing, that I want to make clear and submit to the Untied States Senate pointing out the president has no authority to unilaterally attack Iran. And I want to make it clear, I want it on the record, and I want to make it clear, if he does, as chairman of the foreign relations committee and former chair of the judiciary committee, I will move to impeach him."