There are certain reactions that you aren't allowed to show in Berlin, for example that you feel offended. If you do, the best-case scenario is a sympathetic article along the lines of: Nice guy, but he's not up to it. The alternative is to don a suit of armor and become cynical. But that's not healthy either: Cynicism is the worst characteristic a politician can have. That's why you have to have an internal balance in Berlin, so you can stay true to yourself. And I have that.

Trump believes politics is a staged fight. But it is not. Still, clear words are sometimes needed in politics. In that sense, I believe I am better than Mrs. Merkel.

I am critical of the fact that Hungarian Prime Minister Viktor Orbán is pulling out of everything - the joint approach to the refugee issue, for example. He cannot disparage his colleagues in the EU either - that's not how we treat each other. We require solidarity: in refugee policies, just as in the financial architecture of the structural funds from which countries like Hungary have strongly profited from for years.

The dream of Europe is a region of freedom and peace, of security, law, democracy, tolerance and mutual respect. If you look into the faces of the refugees you will see this dream. These are people who are fleeing from war, hate, violence and unjust systems.

The construction of social housing and the attempt to support families seeking to buy their own homes are all projects from the 1960s and '70s. It all sounds old-fashioned, but it is actually completely modern.

Donald Trump has made the principle of purposely breaking a taboo into a means of achieving his political objectives, which is something that he has in common with Turkish President Recep Tayyip Erdogan and Hungarian Prime Minister Viktor Orbán. Trump systematically violates international rules. But we cannot allow ourselves to forget that Trump is not the U.S.

Would I sacrifice a friendship to take a step forward in my political career? Thus far in my political career, I have been spared from having to make such a decision, thank God. And I can't imagine what it must be like.