serve for four-year terms and represent one of four regions. The national legislature would have veto power over state laws. The legislature would elect a chief executive called a president. The president and his cabinet would have veto power over legislation. The plan also included a national judiciary. On May 30, the Convention agreed, at the request of Gouverneur Morris, "that a national government ought to be established consisting of a supreme Legislative, Executive and Judiciary". This was the convention's first move towards going beyond its mandate merely to amend the Articles of Confederation and instead produce an entirely new government. Once it had agreed to the idea of a supreme national government, the convention began debating specific parts of the Virginia Plan. Congress The Virginia Plan called for the unicameral Confederation Congress to be replaced with a bicameral Congress. This would be a truly national legislature with power to make laws "in all cases to which the separate states are incompetent." It would also be able to veto state laws. Representation in both houses of Congress would be apportioned according either to quotas of contribution (a state's wealth as reflected in the taxes it paid) or the size of each state's non-slave population. The lower house of Congress would be directly elected by the people, while the upper house would be elected by the lower house from candidates nominated by state legislatures. Proportional representation Immediately after agreeing to form a supreme national government, the delegates turned to the Virginia Plan's proposal for proportional representation in Congress. Virginia, Pennsylvania and Massachusetts, the most populous states, were unhappy with the one-vote-per-state rule in the Confederation Congress because they could be outvoted by the smaller states despite representing more than half of the nation's population. Nevertheless, the delegates were divided over the best way to apportion representatives. Quotas of contribution appealed to southern delegates because they would include slave property, but Rufus King of Massachusetts highlighted the impractical side of such a scheme. If the national government did not impose direct taxes (which, for the next century, it rarely did), he noted, representatives could not be assigned. Calculating such quotas would also be difficult due to lack of reliable data. Basing representation on the number of "free inhabitants" was unpopular with delegates from the South, where forty percent of the population was enslaved. In addition, the small states were opposed to any