

I’ve read before that there has been a law passed disallowing the American president to decide to leave NATO. The republicans (having a majority) would have to vote in favour of leaving NATO in the American parliament. I’m not sure how unlikely that is, but the US republicans getting rid of NATO would be very interesting…
But the US don’t need to leave NATO to destroy it. All Trump needs to do is say the US won’t come to the assistance of NATO partners in the event of an attack. NATO could die in irrelevance instead.
I don’t know, but according to the Dutch Chief of Defence Mart de Kruif, it would trigger article 5 against the attacking NATO member: