Will Biden try to impeach Obama?

"The president has no Constitutional authority to take this nation to war against a country of 70 million people unless we’re attacked, or unless there is proof that we are about to be attacked. If he does, I would move to impeach him. The House obviously has to do that– but I would lead an effort to impeach him. The reason for my doing that- I don’t say it lightly, I don’t say it lightly." - Joe Biden, 2007