Ukraine's military intelligence chief talks about Russia and Donald Trump 2:39

(CNN) --

The Secretary General of the North Atlantic Treaty Organization (NATO), Jens Stoltenberg, said that former US President Donald Trump's comments about the alliance put European and American soldiers in greater risk.

Trump said at a campaign rally on Saturday that he would encourage Russia to do "whatever it wants" to any NATO member that fails to meet defense spending guidelines.

  • Trump says he would encourage Russia to 'do whatever it wants' to any NATO country that doesn't pay enough

In a statement on Sunday, Stoltenberg issued a warning against any comments that undermine security. "Any attack on NATO will receive a united and forceful response," he said.

“Any suggestion that allies will not defend each other undermines all of our security, including that of the United States, and puts American and European soldiers at greater risk.

"I hope that, regardless of who wins the presidential election, the United States will continue to be a strong and committed NATO ally," he said.

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