A Google search on "Mark Levin" OR Scalia "limitations to the Constitution" returns only 2 results, neither of which supports your claim.
The second result does paraphrase Justice Thomas as saying there are "key structural limitations to the constitution that ensure that the federal government does not amass too much power at the expense of the states." One such structural limitation is the Tenth Amendment - I guess Clarence Thomas is another extreme ranter and raver.
Scalia used the term in a recent interview with Fox News....his was a reference to the 2nd amendment but it reveals his thinking. Have you even read Men in Black?