Jorg Asmusen, member of the executive board of the European Central Bank, and Jens Weidmann, president of Germany's central bank, the Bundesbank, argue on opposite sides before the German Constitutional Court in Karlsruhe. Weidmann says the bond buying of sovereign bonds of Italy and Greece by the ECB is unconstitutional, Asmussen defends the ECB's plan to lower the borrowing costs for Italy and Spain in 2012. Both Asmussen and Weidmann are students of Manfred Neumann, professor of Economics at Bonn University. Neumann says such action is unconstitutional. The Federal Constitutional Court takes public opinion into account in its rulings.