The USA were the only country that invoked NATO article 5 after 9/11. Every NATO nation came to help in Afghanistan. 1,144 NATO soldiers, among them 60 Germans, died during this war.
Trump questioning if we would help despite easily proving that we did and then even belittling it (They stayed a little back, little off the frontlines) is the most shameless and disgusting statement in that reference that deranged and dishonorable draft-dodger could utter.