There has been an assumption that there is a rolling agreement along these lines, that a president from a large state is followed by a president from a small state, and one from the political left will be followed by one from the political right: Roy Jenkins (British socialist) was followed by Gaston Thorn (Luxembourgish liberal), Jacques Delors (French socialist), Jacques Santer (Luxembourgish Christian democrat), Romano Prodi (Italian left-wing Christian democrat) and Jose Barroso (Portuguese Christian democrat). However, despite these assumptions, these presidents have usually been chosen during political battles and coalition-building. Delors was chosen following a Franco-British disagreement over Claude Cheysson, Santer was a compromise after Britain vetoed Jean-Luc Dehaene, and Prodi was backed by a coalition of thirteen states against the Franco-German preference for Guy Verhofstadt.