the president arriving for the g-20 summit there. he has a series of big meetings which begin within hours. he will sit down with with the german chancellor, angela merkel today. tomorrow, his face-to-face meeting with vladimir putin. his stakes could not be higher. again, the president touching down here. as for his reception in germany, may not seem as warm as he seemed. angela merkel setting the stage for what could be confrontational moments. as we are watching the plane land, let's go to frederik pleitgen. fred? >> reporter: there certainly have been. one of the things you have been talking about is the reception by angela merkel and the city of hamburg as well. that certainly won't be as warm as we saw in poland. we are at the place where protesters are gathering not only protests against president trump here, but, of course,