I have no problem with that statement. Trump is laying down a much needed marker. US Ambassadors in NATO countries have been relaying the message for decades that we want more burden sharing from our NATO partners. Not only has it been largely ignored, the other members continue to reduce their defense expenditures. We can't continue under these conditions supporting an alliance where the other members are unwilling to pay their fair share. The US is in dire financial trouble.
Could have the consequence of Europe surrendering to Islam.
Then we even get to spend more treasure.