Augustus
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Sanders 'can't guarantee' Trump hasn't used the n-word, but hasn't heard him do it - CNNPolitics
"Well, maybe he said it. I didn't hear him say it. " Appears to be the present strategy.
"I can't guarantee anything, but I can tell you that the President addressed this question directly."
Could easily be intended as "I personally can't say because I'm not him, but he has unequivocally denied it so what more do you want me to add?".