In what way? A Russian attack on Germany or a NATO ally is something the US would definitely go to war over. I know it's popular now to freak out because Trump is president, but nothing has changed in this regard.
You can't decide who to go to war for under NATO, it's all or nothing.
Not to mention that ssignaling to Russia that the US might not intervened under Article 5 is a good way to start WW3.
NATO works because the fate of a the Baltics is equal to the fate of Germany.
The problem is that Europe has enjoyed the umbrella that the US provides under NATO too long without owning to its own obligated defense commitments under the treaty.
I don't understand why people are calling out the Trump administration because of this.
Sec def Gates had much more damning things to say about NATO under Obama and the EU's unwillingness to commit its obligated military spending goes as back as Reagan.
After that US influence in the region is going to be pretty much gone.
EU plotitians are going to be much more open to Russian world views since they will not gamble their security on US internal politics.
The exact same thing happened in the Middle East under the previous administration moving Russia from a loud but mostly sidelined actor to the main stage.
Germany though, is a whole different ball game. There are different tiers of countries in the view of the US. Countries like Germany, are in the tier of "we will go to war if you declare war against them". Even if Trump is president. He is right to question the alliances, though.