In a statement in newspapers in France, Germany, Italy, Spain and Poland, he said:
We are a major European power, a major European player. But do we think that the European Union has sometimes overreached itself with directives and interventions and interferences? Yes, it has. And that needs to change.
There are some reforms I think we need to make. Already we're starting to make some of them.
The agenda of the speech is change that all of Europe can benefit from. It is a more competitive, open, flexible Europe for all countries of Europe. And the second thing is that - you know, this is not about cherry-picking, but to argue as some do that you can't have a flexible Europe is wrong.
We can have a flexible Europe where we don't all have to do the same things in the same way at the same time.
More top news
Queen Elizabeth II is to celebrate her 92nd birthday with a star-studded line-up at the Royal Albert Hall in London.
Both figures were not taken seriously before being appointed to their huge roles, but the similarities don't stop there.
The US president, who has not visited the UK since being elected, is reported to be planning a summer trip to Britain.