QUESTION: I was going over my notes again from our class on McCulloch and had a question. You mentioned that the Necessary and Proper Clause does not grant any power in and of itself, and that Congress is entitled to adopt appropriate means, but only in service to some other enumerated power, such as the commerce power or the power to establish post roads (or something like that). What was the other enumerated power for Congress in this case?
ANSWER: Very good question. Marshall never directly answers this question, but Hamilton did (in his memo to President Washington about the constitutionality of the first Bank of the United States, and on which much of Marshall's opinion in McCulloch was based). The principal ones? The power to raise and support an army and navy; the power to pay the debts of the United States; the power to borrow money; and the power to collect taxes. Those are all enumerated powers elsewhere in Article I, section 8, and establishing a Bank of the United States, in the Court's view, was "appropriate" or "conducive" to those ends.
QUESTION: Does that mean that in the case of McCulloch, Congress had the power under the Necessary and Proper clause to create the bank in service to the Commerce Clause?
ANSWER: I'm unsure about this. Claiming that the creation of the bank was necessary and proper to regulate interstate commerce might have been plausible. But the federal regulation of interstate commerce at the time was quite minimal. So it is possible, but I do not know. Regardless, there were the other enumerated powers (mentioned above) that the creation of the bank was a means to accomplishing. Thus, whether the bank was a proper means to the regulation of interstate commerce ultimately did not matter.
QUESTION: Also, does this mean that when we look at a statute we should first look at whether it was "necessary and proper" and then look to see if there is another enumerated power that it functions in service to?
ANSWER: I think that probably has things backwards--at least in my mind. Here is how I think about it. First, I ask whether it rather directly serves an enumerated power, and then I ask whether, given the additional leeway provided by the Necessary and Proper Clause, it might still be justified by the two clauses together. Put differently, the Necessary and Proper Clause, at least since McCulloch, has meant that Congress has fairly broad leeway in its choice of means. But the means must be in service of an enumerated power. And we cannot really evaluate whether a law is an appropriate means without first asking, "A means to what?" So before you can even think about the Necessary and Proper Clause question, you have to have identified the relevant enumerated power.