I consider the foundation of the Constitution as laid on this ground that 'all powers not delegated to the United States, by the Constitution, nor prohibited by it to the states, are reserved to the states or to the people.' To take a single step beyond the boundaries thus specially drawn around the powers of Congress, is to take possession of a boundless field of power, not longer susceptible of any definition. --Thomas Jefferson

The Constitution on which our Union rests, shall be administered ... according to the safe and honest meaning contemplated by the plain understanding of the people of the United States at the time of its adoption.... --Thomas Jefferson

I think about 80 to 95 percent of what the Federal government does has no Constitutional authority.