“That’s why I want to be very clear: If the President takes us to war with Iran without congressional approval, I will call for his impeachment. I am dead serious. … I’m saying this now to put the administration on notice and hopefully to deter the president from taking unilateral action in the last year of his administration.”
— Sen. Joe Biden, quoted by the Des Moines Register.
It doesn’t get any more definitive. It sounds like something a candidate qualified to be President would say. [Hat tip to Political Wire]