It is one of Parliament's most important tasks.
After every federal election, the Election Review Committee checks whether everything has gone according to plan.
MEPs decide whether they are legitimately seated in Parliament.
So far, no one has been bothered by this, the procedure was considered tried and tested, even if it is handled differently at state level.
However, the election chaos in Berlin has now raised the question: is it right that MPs of all people should decide on objections to the election - and thus on their own future and party-political interests?
Neutral authority requested
The traffic light coalition only pushed through the re-election in around 400 Berlin electoral districts, the Union wanted the re-election in many more districts - but that would have endangered even more mandates of the coalition and the left.
Cross-party consideration is now being given to placing the election review in the hands of the Federal Constitutional Court.
That would be welcome, because the political dispute over the re-election has cost a lot of trust.
Ideally, the decision should be in the hands of a neutral body whose judgment is not clouded by self-interest.
Certainly a complaint will be filed in Karlsruhe against the decision of the traffic light majority in the Bundestag.
In the end, the Federal Constitutional Court will decide anyway.