Particularly in periods of crisis, governments have the obligation to lead by good example! Instead, many in Europe are confronting this global challenge with a penny-pinching mentality that drives me crazy.

The dangerous glorification of the nation state, and the baiting of minorities that goes along with it, releases an anti-democratic energy.

At the end of the day, men like Donald Trump need to be given that which they themselves dispense: clear messages. I would confront him as clearly and explicitly as possible. It is not only the right, but also the duty, of the leader of a German government to do that.

We need a big debate in society about how we are going to shape Europe and tame capitalism. A government must provide direction and make concrete proposals. It is one of Angela Merkel's biggest failings that she doesn't do this.

I really don't have time at the moment for coalition debates. The voters will decide what the next parliament will look like. Those who wish to form a coalition with The Social Democrats can take a look at our platform and then they are more than welcome to talk to us.

I cannot guarantee people absolute fairness. I can only promise that I will do everything in my power to secure fairness or create a greater degree of fairness.

If we want to create new rules of globalization, then we can't just think in terms of the nation state. The nation state has long offered protection. But it suffers from the fact that many citizens increasingly fear that it can no longer protect them: The threat of transnational terrorism is growing. Freedom of movement rules in Europe facilitate social dumping. Regardless of the make-up of the next government, it must have clear ideas on how to overcome the lack of direction of recent years.