I take note of the fact that there are a lot of people who appreciate what I do as parliament president, not just within my Social Democratic party group, but also among the conservatives.

It is impossible to swear an oath to the German Basic Law without realizing that our constitution is among the most liberal constitutions in the world. As the head of government in such a country, I would stand up to all those who call into question this free, open and tolerant model of society.

Following the attacks in Paris, French President François Hollande has a completely different set of concerns. France needs more police, more security personnel and a greater emphasis on integration. He says that security is more important than the Stability Pact.

Now Europe are experiencing a wave of eroding solidarity, first of certain societies and then entire governments. At the same time, we have two giant new challenges to meet: the migration movement and terror. And then Great Britain is thinking about leaving the EU. That should suffice as a description.

We need a common European tax policy that closes these tax loopholes. We need a common European social policy that prevents social dumping. We need an effective securing of our external borders and a smart way of fighting terrorism. Acting as a state within a national framework is no longer enough. The German chancellor has completely failed to convey that throughout her years in power. We need a re-start for Europe.

It is courageous to occasionally admit that there are certain things one can't do.

CDU head Angela Merkel has tried for years to serve two sides: the conservative side by holding up her CDU party membership. But then at the same time she acts as though she were also a Social Democrat. I don't have this hydra-headed nature. In the end, people will vote for the Social Democratic original.