The obligations of the Union toward a State were freely discussed; whether "new states may be admitted by the Congress" meant "must" be admitted. On a small scale the discussion rehearsed the Hayne-Webster debate a decade later. Occasional pleas were heard for "the old Republican doctrine which limited the general government to the expressed powers and prevented it from encroaching on the young states or on the free movement of personal property." Various phrases in the Constitution were quoted both to prove and disprove the power of Congress to prohibit slavery in a new State. "The citizens of each state shall be entitled to all privileges and immunities of citizens in the several states," it was claimed, would permit the migration of slaveholders to Missouri with their property. "The migration or importation of such persons as any of the states now existing shall think proper to admit shall not be prohibited by the Congress prior to 1808," was said to permit, conversely, such prohibition after that date. The other side claimed that the clause was intended to refer solely to slaves imported into the United States and not to interstate migration. Under the clause that the Congress shall guarantee a republican form of government to every State, the Declaration of Independence was quoted to prove that freedom is the natural condition of a republic and that slaves were held only pending their emancipation. Such sentiments drew a sharp rebuke from the opposing side. Slaves might even then be in the gallery, it was said, to overhear such revolutionary doctrine. So persistent were members in hunting up and interpreting various phrases of the Constitution, each to suit his own views, that one disgusted Republican protested against "a species of special pleading which hunts for powers in words and sentences taken here and there from the instrument and patched together forming something like a pretext for the exercise of power palpably interdicted by the plain sense and intention of the instrument." The cry of "home rule" for the State of Missouri on the slavery question was the forerunner of "squatter sovereignty" two decades later. Calhoun's later plea that any citizen had the right to migrate to any part of the co-operative public lands and to carry with him all his property found a first hearing in this debate on the admission of Missouri.