Here we examine the final steps the deputies elected to the Estates General of 1789 took to transform that traditional body into a national constituent assembly. We will examine three steps in detail, again relying on a broad array of sources to show how the decisions reached were shaped by the interplay between different developing political groups within the Assembly. First, as the summer of 1789 came to an end, the deputies sought to establish their power to craft France’s new constitution as they saw best, guided by the wishes of their constituents, not by the will of the king. By the middle of September, the king had yet to accept the August decrees or the Declaration of the Rights of Man and Citizen. From 14 to 21 September, the deputies debated how to ensure that the king would accept the decrees without modification. As part of this discussion, the deputies broached the question of whether or not the king had the right to request changes to the constitution they were writing. They were careful not to cause unnecessary conflict between the king and the Assembly.