Article 5 is the principle of collective and mutual defence, meaning an attack against one NATO ally is considered an attack against all members.
The US president spoke to reporters on Air Force One on his way to the NATO summit in The Hague and was asked about his commitment to Article 5 of NATO.
Mr Trump replied: “Depends on your definition. There are numerous definitions of Article 5. You know that, right? But I’m committed to being their friends. You know, I’ve become friends with many of those leaders, and I’m committed to helping them.
“I’m committed to saving lives. I’m committed to life and safety, and I’m going to give you an exact definition. When I get there. I just don’t want to do it on the back of an airplane.”
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