At the NATO summit from 2017 (Brussels), Donald Trump emphasized that many NATO members are not contributing enough (source):
Twenty-three of the 28 member nations are still not paying what they should be paying and what they are supposed to be paying for their defense. This is not fair to the people and taxpayers of the United State
This is not the first time when the USA President said this.
This article dives into details by showing graphs related to military expenditures of NATO countries reported to their GDP and confirms what Donald Trumps has emphasized:
The United States has a point in noting that its commitment is disproportionately large. Last year it spent 3.6% of its GDP on defence, the highest ratio of any NATO member (and the highest total military budget in the world by a hefty margin). That is almost double the target of 2% of GDP that NATO members all agreed to in 2006. At the time six members reached the threshold; last year five did.
Question: Wouldn't diminishing of USA NATO related expenses force the other countries to compensate (at least, obey the 2% of GDP agreement)?