what hillary is saying is that she's not qualified to answer the question and she'll follow the recommendation of the review that she put in place. in a technical sense, it's a correct position. sanders is really not qualified to take a position before the review completes, either. it's fact-based reasoning.

i mean, suppose she says she opposes it and then the review she put in place confirms it, or vice versa. then, why did she put the review in place if she was going to ignore it?

the purpose of the review is to establish the facts.

now, that said, there's certainly some politics in this. did we need a review to determine the facts? and is the review process fair and unbiased?

but, she could hardly take a position on a fact-finding review process that she set up before it finishes.