When trump stated that merkel was not contributing towards her fair share of the defense of Europe and nato, he said something the Deutsches Bundeswehr has known for years. When I visited their flagship this was something German personnel knew. One example of this is how the German Aircraft Carrier has been put on hold, you can view more details at the link below
This goes along with other Bundesheer, Bundesmarine, and Luftwaffe projects put on hold by merkel so social services, including refugees can be maintained. Additionally when the postwar constitution is mentioned even america and nato agree it is outdated and political sneaking of weapons programs should not occur, as Deutschland has proven repeatedly it has moved past the nazi extremes of decades ago and would rearm sooner.