Never Trust The King With The Army by poputonian
As John Bonifaz described in his 2003 book Warrior King: The Case For Impeaching George W. Bush, the vote to authorize the Iraq war violated the War Powers clause of the U.S. Constitution:

“In drafting the War Powers Clause of Article 1, Section 8, the framers of the Constitution set out to create a nation that would be nothing like the model established by European monarchies. This is why they made the momentous decision of whether or not to send this nation into war a matter to be decided solely by the people, through their elected representatives in Congress.”

Before suggesting that it was Congress who made the choice for war, consider another example from Bonifaz. He says:

“Imagine this: The United States Congress passes a resolution which states: “The President is authorized to levy an income tax on the people of the United States as he determines to be necessary and appropriate in order to pay for subsidies to U.S. oil companies.” No amount of legal wrangling could make such a resolution constitutional. Article 1, Section 8 of the Constitution grants the power to levy taxes solely to Congress.”

But this is old stuff. Glenn Greenwald has the latest on who should make the call on war with Iran. Glenn’s post contains his normal extraordinary insight, coupled with Federalist gems that remove any ambiguity about who can make war.