The short answer is, someone on his published list, first issued this past May and expanded in October. I wrote about why we should anticipate that Trump will stick to the list for his first Supreme Court nominee, this month in the Daily Journal. My bottom line to those on the left (and a few on the right) who expect the worst of a Trump presidency:
Given what they fear from a Trump administration, I encourage my liberal and progressive friends to rediscover and embrace an independent judiciary that serves as a check on unilateral presidential action, that independently interprets the law rather than deferring to what the president says it reads, and which prioritizes constitutional governance and individual liberty over letting the president have his way simply because he is the president.
You can read the whole piece here if you are not a subscriber to the Daily Journal.