All of Trump's problems begin with personnel, because he picks them.
From the story here:
Richard Grenell had taken up his diplomatic posting in Berlin on May 8, and immediately irked Germany when he tweeted on the same day that German companies should stop doing business with Iran as Trump quit the nuclear deal with the Islamic Republic.
He stoked further outrage over the weekend with reported comments to far-right website Breitbart of his ambition to "empower other conservatives throughout Europe, other leaders".
Grenell also raised eyebrows with his plan to host Austria's arch-conservative Chancellor Sebastian Kurz -- who the US envoy describes as a "rock star", for lunch on June 13.