President of the European Council extended his influence into financial policy, the most important area left to the rotating Council presidency, with the rotating presidency seeing a greater decrease in power than previously planned. Many of the changes introduced with the Lisbon Treaty need concretion through practical implementation by the current actors. The Spanish presidency unsuccessfully tried to challenge the European Council president's prominent post during the first rotating presidency of 2010, while the second half of the year saw a Belgian rotating presidency marked by a weakened caretaker government which did not challenge Herman van Rompuy, himself a Belgian politician. The Belgian rotating presidency
President of the European Commission Commissioner to resign. The work of the Commission as a body is based on the principle of Cabinet collective responsibility, however in his powers he acts as more than a first among equals. The role of the President is similar to that of a national Prime Minister chairing a cabinet. The President also has responsibility for representing the Commission in the Union and beyond. For example, he is a member of the European Council and takes part in debates in Parliament and the Council of Ministers. Outside the Union he attends the meetings of the G8 to represent the Union.