I don’t recall from your description. Can you identify it a little more - maybe a rough time frame? I’d like to find out more about this event.

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Below is a long article, and I excerpted the gist of the incident. Still looking for the reports by unnamed State Department Personnel in our German Embassy expressing public concerns to the press about Trump's naivete and interference.

pbs.org - Trump scolded germany for buying gas from russia heres what we know

Trump scolded Germany for buying gas from Russia. Here’s what we know
World Jul 11, 2018 3:29 PM

BRUSSELS — President Donald Trump wasted no time in escalating his verbal attacks on Germany in the opening leg of his European tour. Seated across from NATO Secretary General Jens Stoltenberg at breakfast Wednesday morning ahead of the alliance’s meeting, Trump expanded his criticism beyond how little – in his view – Europe’s most powerful economy spends on defense to target where they buy their energy.
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Trump complained Germany is “making Russia richer.” When the NATO secretary general told Trump trade was a separate matter, Trump fired back. “How can you be together when a country is getting its energy from the person you want protection against or from the group that you want protection against?” he asked. “I think it is a very bad thing for NATO and I don’t think it should have happened and I think we have to talk to Germany about it.” From Trump’s perspective, trading with adversaries is bad business.