This Techdirt article on Walton's implementation of Obama's NSA reforms is worth a read.

Walton seems resistant to turning the court into an oversight entity, which it really isn't. That's supposed to be the legislative branch's role, but that has been undermined by cheerleaders masquerading as overseers who have withheld information from their fellow legislators. Walton also may not trust the agency enough at this point to feel comfortable approving RAS requests.