Trump's remarks had ZERO effect on any NATO member 2019 defense budget.
It isn't his remarks. They, if anything, undermine efforts to get Europe to boost their defenses because they make increasing spending politically more difficult. Nobody wants their constituents to think they were intimidated into doing something.
However, one thing that discouraged Europe from boosting its defenses (especially within NATO rather than through building an EU military) was our own drawdown. If we didn't seem committed to NATO, it made our calls for them to spend more ring hollow. (This is why Democrats don't have any credibility on the issue even though they're correct when they criticize Trump for rhetorically undermining the alliance.)
Obviously, nobody expected us to stay at Cold War levels (been 250K and 350K troops) after the fall of the Soviet Union, but we took them far too low in the early 2010s even though Russia was rapidly building its military. In fact, when we closed the Mannheim and Heidelberg communities in 2013, we didn't have a single tank on the continent and had plans to cut back even further. The Obama Administration did reverse course after Crimea, and the Trump Administration has gone further.
In fact, NATO members reaction to Trump's remarks was to make plans to defend Europe in the event the US leaves NATO.
And this is the problem. While we've been building up our forces (which was likely the work of Secretary Mattis), Trump's rhetoric was often going in a different direction. Were his comments negotiating tactics or real policy? An ally has no way to know, which is why support is building for countries to put new forces into an EU military rather than under the NATO command.
We've been able to somewhat manage the issue, because Mike Pence in coordination with Mattis was often the one dealing directly with European leaders on the specifics. Mattis is obviously a brilliant guy, and Pence has always been supportive of the alliance. However, Mattis is out, and Pence only has authority that Trump gives him. So who knows what's going to happen next?
You would think Trump would declare victory in his agenda of a more self-reliant European defense, right?
He talks out of his *** on foreign policy. He doesn't know what he wants or what constitutes a victory. Frankly, that was the biggest reason why I didn't vote for him. Europe isn't supposed to be "self-reliant." It's supposed to be defended by an alliance of nations who put forth a floor of effort (2 percent of GDP) under a unified command. That system has kept a previously war-torn continent at relative peace for 70 years.
The unloading and walk of shame they felt climbing out of the bus. 
