What happens if one NATO member attacks anohter?

As the title says what happens if one NATO member attacks another? WIth Trump threatening Denmark over Greenland and Panama over the canal, what would and should other NATO members do? Personally I think they could kick America out of the alliance, Trump is threatening Canada too, albeit with serious economic sanctions, but is this any less an act of war than a military option? What does he want Canada for anyway?

People think it's all just noise and that he won't do any of these things once in office, I'm not sure I believe that, I think there's every chance he will.

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  • The wider global geopolitical situation is really tense right now including in Ukraine v Russia (regardless of Putin or his generals) and many nuke countries like Russia, North Korea, the CCP, Afghanistan (Taliban/Isis) Syria & Iran are reported to be collapsing from within, yet are all (even the CCP, itself a globalist player and against Taiwan) poised to fire their nukes at the west if NATO and the CCP (for its own interests alone) invades Russia after Russia’s defeat in Ukraine, even if they don’t feel threatened themselves - the very fact that the U.K. has nukes makes the U.K. into a prime target for such unhinged nuke nations who just want to settle decades long disputes with the west and in such circumstances, no nation in the world can truly call itself neutral when one nation fires its nukes across the borders of another nation - aside from my native Ireland, who is neutral yet a member of the UN Security Council and is heavily reliant on the RAF and the Royal Navy for its defence needs, the other neutral countries include Switzerland and Austria, who are prepared to defend their neutrality by Millitary means - I simply don’t trust Trump, as he has decieved and betrayed the American people far too many times since 2016 

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  • The wider global geopolitical situation is really tense right now including in Ukraine v Russia (regardless of Putin or his generals) and many nuke countries like Russia, North Korea, the CCP, Afghanistan (Taliban/Isis) Syria & Iran are reported to be collapsing from within, yet are all (even the CCP, itself a globalist player and against Taiwan) poised to fire their nukes at the west if NATO and the CCP (for its own interests alone) invades Russia after Russia’s defeat in Ukraine, even if they don’t feel threatened themselves - the very fact that the U.K. has nukes makes the U.K. into a prime target for such unhinged nuke nations who just want to settle decades long disputes with the west and in such circumstances, no nation in the world can truly call itself neutral when one nation fires its nukes across the borders of another nation - aside from my native Ireland, who is neutral yet a member of the UN Security Council and is heavily reliant on the RAF and the Royal Navy for its defence needs, the other neutral countries include Switzerland and Austria, who are prepared to defend their neutrality by Millitary means - I simply don’t trust Trump, as he has decieved and betrayed the American people far too many times since 2016 

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