Christian Ude, the mayor of Munich from the Social Democrats party, says the Christian Social Union's (CSU) hold on power in Bavaria is likely to be challenged in coming elections. One of the reasons for this is that people are moving to Munich from all over Germany because many companies are hiring. Siemens, Audi, BMW and many Mittelstand companies are based in Munich, and unemployment is the lowest in Germany. The CSU, a partner in Merkel's coalition government, is particularly critical of measures to aid Greece, and steps taken by the ECB to buy the bonds of Spain and Italy to reduce borrowing costs, making it difficult for Merkel to provide flexibility in her negotiations with other eurozone countries.