Complementing the nation-state as it reaches its limits amid globalization: That is what Europe must offer.

You have to let the people vote when it comes to a new constitution.

The old fundamental principles must continue to apply, even in our changing society: Democracy knows neither master nor slave. Equal education opportunities for all, no matter where they come from and no matter who their parents are. Equal access as well when it comes to digitalization.

Gerhard Schröder offered a clear German NEIN to an American president's war of aggression that was in violation of international law. That took courage. Ms. Merkel did not join him at the time. If Trump now begins to take the wrecking ball to our set of values, we must say clearly: That is not our approach.

The claim made by Hungarian Prime Minister Viktor Orbán that the refugee question is a German problem is incorrect. It is a European problem.

I spoke with Gerhard Schröder about a lot of things, including foreign policy. Schröder knows how important European policy is to me personally. I have worked together with Angela Merkel on European policy for many years, so I was surprised when Volker Kauder who has little experience in European policy, claimed that I had not represented German interests in Europe. That's an example of how the conservatives conduct an election campaign.

The principles of the SPD have remained the same for 150 years: democracy, human dignity, justice and inclusion. We will never change those principles.