NATO chief says Trump criticism 'does undermine the security of all of us'

The chief civil servant of the North Atlantic Treaty Organization said former President Donald Trump's rhetoric about the organization does "undermine" the security of its members.

NATO Secretary-General Jens Stoltenberg made the comments during a press conference at the organization's headquarters in Brussels on Wednesday.

"The whole idea of NATO is that an attack on one ally will trigger a response from the whole alliance and as long as we stand behind that message together, we prevent any military attack on any ally," Stoltenberg said.

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He continued, "Any suggestion that we are not standing up for each other, that we are not going to protect each other, that does undermine the security of all of us."

The warning comes after Trump offered harsh words for NATO allies at a campaign rally last week, going so far as to suggest the U.S. would not defend NATO allies that do not contribute their full share.

Trump recalled a conversation he had with the president "of a big country," who he says asked him if they did not increase their defense contribution to the North Atlantic alliance "and we’re attacked by Russia, will you protect us?"

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"NATO was busted until I came along," Trump said. "I said, ‘Everybody’s gonna pay.' They said, ‘Well, if we don’t pay, are you still going to protect us?' I said, 'Absolutely not.' They couldn't believe the answer."

While Stoltenberg expressed concern at Trump's remarks, the former president's comment did spark a rush to confirm member countries' contributions in the coming year.

The NATO chief announced that 18 of the alliance's 31