Almost before the Estates General began meeting the Third Estate was to pull out. They did so formally on June 10, 1789 and formed the National Assembly, which in theory was open to everyone. Interestingly enough, a member of the Second Estate, Abbe Sieyes was the one who sponsored the National Assembly.He proposed moving the Third Estate, and any member of the other Estates to join this separate verification process.nterestingly enough, a member of the Second Estate, Abbe Sieyes was the one who sponsored the National Assembly. He proposed moving the Third Estate, and any member of the other Estates to join this separate verification process.