President-elect Donald Trump moved quickly in naming his picks for two key legal posts, selecting a conservative politician in Sen. Jeff Sessions to run the U.S. Department of Justice and a loyal adviser in Jones Day partner Donald McGahn II to serve as White House counsel.

Washington lawyers now have their eyes on a less visible appointment, but one that could set the tone on issues ranging from how completely the incoming president separates himself from his business interests to how his administration acts on campaign promises to spike trade agreements and revive harsh interrogation policies.