Both sides have been very restrained in saying *not* the truth out loud, I think because its one of those things that once spoken can't be taken back (kinda like telling your spouse you are considering divorce).....

Once it gets to the stage where they are "saying it out loud" Trump is going to have the better narrative...."why should american tax dollars be paying for french defense....etc" 

Domestically it would be hard for democrats to counter this as Trump will use the same message. 

Having said all that, there are quite of few negative things that will probably come from this....I can't see how this doesn't lead to active animosity between US - EU going forward. Tariffs, fines against US companies, travel restrictions, etc....

freetx

Greenland as a substitute for NATO is the only explanation that makes much sense to me, because there are agreements in place already that allow the US military to pretty much do whatever they want in Greenland.