Since immigration is Trump’s big issue, I seriously doubt he’d nominate an amnesty advocate.
But he is in the top 3 per reports. There are questions about Kavanaugh (Vince Foster case), Kethledge (immigration), Barrett (was wishy washy on Trump prior to election). Most even here seem to not understand that people are very complex and difficult to know. We are surprised about people we marry after all. The safest choice, is someone politically known, for many years preferably.