I find it surprising, however, that many German politicians generally oppose referendums, but then when it's an EU matter, they immediately scream for a plebiscite.

We now have two options: We can commence operations at the Hotspots in Italy and Greece and continue to do nothing - in which case they would soon be overflowing. Or we can show responsibility and organize a distribution system that takes into account the limits of each individual member state. Migrants, for their part, must recognize that, while they have a right to protection, they do not have the right to freely choose the country. In addition, it is clear: Not everybody can come to us.

In 2003, Helmut Schmidt said: Predatory capitalism exists, we have to civilize it and we can do that via Europe. He was right. We haven't tried hard enough.

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.

If we want to strengthen the EU, then we urgently need a two-pronged approach. First, we can save a lot of money if we finally move to harness synergy effects in military spending. The parallel structures in the individual armies still remain far too costly, and we could save a lot by making joint purchases. Second, we cannot only think in terms of conventional military logic, but instead have to be far better prepared to thwart cyberattacks. Most importantly, we can no longer allow the EU to become bogged down in petty details.

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 have committed ourselves to pursue joint policies, but then national governments say, "We aren't bound by that." That is a dramatic situation, because solidarity is a basic principle that cannot be had on an à la carte basis. If we have rules that nobody adheres to, then the community will break apart.