Carl Bildt, former Prime Minister and Foreign Minister of Sweden, shares his perspective from Europe:

Who's going to be the leading voice politician in Europe after Angela Merkel leaves?

Well, that remains to be seen. First, we need to wait for the outcome of the German election, and then it's going to take quite some time to form a government in Germany to see who's going to be chancellor. And then of course we have elections coming up in France in the spring. Macron is likely to win, but you never know. So by next summer, we'll know more about that. And then there are other personalities there. There's Mario Draghi, prime minister of Italy, who has a strong personality. Mark Rutte of the Netherlands, as long as he's there. So it's going to take quite some time for this to be sorted out.