For more than a year now, Remain Calm blog has requested the impeachment of the President, Vice-President, and to make it known to the Speaker of the House that, should he try to grab a chair in the Oval Office, he too would be impeached.
I am revising this plan, and now fully endorse the sensible strategy of removing from his post the Charming, Straussian-lite, Secretary of Defense, Donald Rumsfeld.
I don't think a cabinet official has ever been impeached before. It is absolutely certain that the Constitution allows for it.
The most enjoyable way to learn a lot of the basics is PBS Frontline's episode entitled Rumsfeld's War.