The uncertainty over who Trump might pick (at one point, he floated his sister) has prompted some to privately encourage the Senate Majority Leader to back off his refusal to give Obama nominee Merrick Garland a hearing. The thinking is two-fold: First, Trump will probably lose to Hillary Clinton. Second, Obama could withdraw the moderate Garland after the election so that President-elect Clinton would get to appoint a vastly more liberal (and younger) alternative.
https://www.washingtonpost.com/news/powerpost/paloma/daily-202/2016/05/19/daily-202-10-takeaways-from-trump-s-supreme-court-shortlist/573d0e24981b92a22d8aeaa8/