L'Enfant secured the lease of quarries at Wigginton Island and further southeast along Aquia Creek off the lower Potomac River's southern bank in Virginia to supply well-regarded "Aquia Creek sandstone" for the foundation and later for the wall slabs and blocks of the "Congress House" in November 1791. However, his temperament and his insistence that his city design be realized as a whole, brought him into conflict with the Commissioners, who wanted to direct the limited funds available into construction of the Federal buildings. In this, they had the support of Secretary of State Thomas Jefferson.