The US Congress giveth and the US Congress taketh away?

[Gator]

Democrats plan bill to limit U.S. war mission
Senators’ move directly challenges authority granted to President Bush

AP

WASHINGTON - Determined to challenge President Bush, Senate Democrats are drafting legislation to limit the mission of U.S. troops in Iraq, effectively revoking the broad authority Congress granted in 2002, officials said Thursday.
While these officials said the precise wording of the measure remains unsettled, one draft would restrict American troops in Iraq to combating al-Qaida, training Iraqi army and police forces, maintaining Iraq's territorial integrity, and otherwise proceeding with the withdrawal of combat forces.
The officials, Democratic aides and others familiar with private discussions, spoke only on condition of anonymity, saying rank-and-file senators had not yet been briefed on the effort. They added, though, that Senate Majority Leader Harry Reid of Nevada is expected to present the proposal to fellow Democrats early next week for their consideration.

Full Report http://www.msnbc.msn.com/id/17286793/

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This is going to get complicated quick in my opinion, and goes far beyond requiring that Troops headed to the Combat Zone be trained and equiped to the standards that the US Congress sets.
I cannot find a quick answer in Article I, Section 8 of the US Constitution as to how the US Congress would go about any such limit after the green light for the Operation was given without taking money away from the Military, or reducing the number of Troops allowed under Arms.

Constitution of the United States
Article I
Section 8. The Congress shall have power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the United States; but all duties, imposts and excises shall be uniform throughout the United States;
To borrow money on the credit of the United States;
To regulate commerce with foreign nations, and among the several states, and with the Indian tribes;
To establish a uniform rule of naturalization, and uniform laws on the subject of bankruptcies throughout the United States;
To coin money, regulate the value thereof, and of foreign coin, and fix the standard of weights and measures;
To provide for the punishment of counterfeiting the securities and current coin of the United States;
To establish post offices and post roads;
To promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries;
To constitute tribunals inferior to the Supreme Court;
To define and punish piracies and felonies committed on the high seas, and offenses against the law of nations;
To declare war, grant letters of marque and reprisal, and make rules concerning captures on land and water;
To raise and support armies, but no appropriation of money to that use shall be for a longer term than two years;
To provide and maintain a navy;
To make rules for the government and regulation of the land and naval forces;
To provide for calling forth the militia to execute the laws of the union, suppress insurrections and repel invasions;
To provide for organizing, arming, and disciplining, the militia, and for governing such part of them as may be employed in the service of the United States, reserving to the states respectively, the appointment of the officers, and the authority of training the militia according to the discipline prescribed by Congress;
To exercise exclusive legislation in all cases whatsoever, over such District (not exceeding ten miles square) as may, by cession of particular states, and the acceptance of Congress, become the seat of the government of the United States, and to exercise like authority over all places purchased by the consent of the legislature of the state in which the same shall be, for the erection of forts, magazines, arsenals, dockyards, and other needful buildings;--And
To make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this Constitution in the government of the United States, or in any department or officer thereof.

In any event the next time the US Congress turns over the keys to the US Military to the President of the United States, I would guess that many teams of Lawyers would be needed to draw up the authorization, with with perhaps a few allowances for rider, after rider, after rider from the US Congress.