We're at a historical juncture: A growing number of people are declaring what has been achieved over the past decades in Europe to be wrong. They want to return to the nation-state. Sometimes there is even a blood and soil rhetoric that for me is starkly reminiscent of the interwar years of the past century, whose demons we are still all too familiar with.

European policy is always an interplay of rationality and emotion.

The EU is a community of values, not military buildups.

Before we talk about further accessions, we have to consolidate the European Union internally. People are increasingly losing faith in the EU's effectiveness.

But if you constantly insist only on your own interpretation, it isn't long before it seems patronizing.

Donald Trump is betraying everything that made America great: tolerance, democratic institutions and respect for the individual. In that sense, Trump is the most un-American U.S. president that the country has had in a long time.

We Germans are particularly aware that you can only be successful on the global market over the long term if you offer energy-efficient products that are, by nature, climate-friendly.