That seems to depend a great deal on what suits one at the time, whether being a strict constructionist best fits a persons interests or whether being a loose constructionist best fits their interest.
Strict constitutionalists argue that one must understand the intentions of those who wrote it, but naturally since they are not here to speak for themselves or see how the world has vastly changed it is debatable as to what their intentions were when they wrote it as well as whether they would amend their intentions according to the changes that have occured over the years.
The truth is that what enumerated powers the constitution does or does not give to the Federal government has been in debate since it was written and likely will continue to be.
There is no consensus on this issue, and until there is there is no right or wrong interpretation, it is just what it is, a difference in opinion as to what the Necessary and Proper Clause as related to the 10th amendment does or does not allow and exactly what the enumerated powers do and do not allow.
Article 1 - The Legislative Branch
Section 8 - Powers of Congress
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The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises, to pay the Debts and provide for the common Defence 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 an 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, dock-Yards, and other needful Buildings; And
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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.
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The Tenth Amendment is similar to an earlier provision of the Articles of Confederation: "Each state retains its sovereignty, freedom, and independence, and every power, jurisdiction, and right, which is not by this Confederation expressly delegated to the United States, in Congress assembled."[1] After the Constitution was ratified, some wanted to add a similar amendment limiting the federal government to powers "expressly" delegated, which would have denied implied powers.[2] However, the word "expressly" ultimately did not appear in the Tenth Amendment as ratified, and therefore the Tenth Amendment did not amend the Necessary and Proper Clause.
The Tenth Amendment, which makes explicit the idea that the federal government is limited only to the powers granted in the Constitution, is generally recognized to be a truism. In United States v. Sprague (1931) the Supreme Court noted that the amendment "added nothing to the [Constitution] as originally ratified."
For several decades after the Constitution was ratified, the interpretation of the Necessary and Proper Clause continued to be a powerful bone of contention between the Democratic-Republican Party and the Federalist Party, and several other political parties in the United States
Interpretation of the Necessary and Proper Clause has been controversial especially during the early years of the republic. Strict constructionists interpret the clause to mean that Congress may make a law only if the inability to do so would cripple its ability to apply one of its enumerated powers. Loose constructionists, on the other hand, feel that the Necessary and Proper Clause expands the authority of Congress to all areas tangentially related to one of its enumerated powers. It is often known as the "elastic clause" because of the great amount of leeway in interpretation it allows; depending on the interpretation, it can be "stretched" to expand the powers of Congress, or allowed to "contract," limiting Congress. In practical usage, the elastic clause has been paired with the commerce clause in particular to provide the constitutional basis for a wide variety of expansive federal laws.