Senate Majority Leader Mitch McConnell on Thursday condemned Republican nominee Donald Trump’s refusal to commit to defending the United States’ NATO allies in the event of an attack.   

“I disagree totally with what he said about NATO,” the Kentucky Republican said in an interview with CNN’s Manu Raju.  

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“It’s the most important military alliance in world history,” McConnell said. “It remains relevant today. Many Americans don’t know that operation Afghanistan has been a NATO operation. And I want to reassure our NATO allies that we will come to the defense of any member that is threatened.”  

Trump told The New York Times Wednesday that he would want to look at a country’s contributions to the alliance before committing to provide U.S. aid in the event of an attack. “If they fulfill their obligations to us,” he said, “the answer is yes.”