The "Bundestag" is Germany's main legislative body. Its over 600 members are elected every four years in a mixed system of constituency and list voting.
All legislation has to pass first the Bundestag and then the Bundesrat, the upper house. The Bundestag is located in Berlin in the "Reichstag" building near the Brandenburg Gate.
Volker Kauder's ousting proves that Angela Merkel's grip on her party is loosening. According to the German press, it's becoming clear that conservative lawmakers are increasingly ready to abandon the chancellor.