Well, Secretary Clinton, the Donald has already seriously begun his crude branding campaign of you with, “Her whole life is a big fat lie!” Now of course you don’t want into get in a pissing contest with the Devil.
So when you are asked about Trump’s charge (a million times) the answer need always be exactly the same, no matter how many times the question is repeated, short and not so sweet: “so says a pathological liar.” Don’t defend, don’t explain. Just endlessly stay with those five words.
Think of it as sort of a modified game of scrabble. Trump keeps laying down his key eight words and you keep adding your five words to his for a double score. No fuss, no muss. Stay with that limited response and the game will quickly become a bore and so will Trump.