"I still don't agree with everything. I mean, for example, I thought what he said about NATO yesterday was ... not accurate," McConnell said Thursday during a Facebook Live interview with The New York Times. "I'm willing to kind of chalk that up to a rookie mistake."
 
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Trump told the Times on Wednesday that if president, he wouldn't adhere to Article 5 of the NATO treaty and defend allies unless "they fulfill their obligations to us."
 
The remarks sparked a string of backlash from GOP senators just hours before Trump is set to accept the Republican Party's presidential nomination in Cleveland on Thursday evening. 
 
McConnell added that NATO is "the most successful military alliance in the history of the world." 
 
"I want to reassure our NATO allies that should any of them be attacked, we'll be there to defend them," he said. 
 
Despite the comments, McConnell said he was generally feeling better about Trump as the party's standard-bearer. He noted that it's unlikely the businessman would pick someone for the top Defense Department or State Department spots "who would have a view different from my own."
 
McConnell made similar comments during an interview with Politico on Thursday, calling Trump's comments "wrong."