Attorney General Loretta Lynch described her Monday meeting with Bill Clinton aboard a private plane as “primarily social,” but even Democrats are struggling to stomach the optics of the attorney general’s meeting with the former president while his wife is under federal investigation. Lynch said she and Clinton talked only of grandchildren, golf, and their respective travels, but the fact that the two spoke privately at all was enough to rekindle concerns about a possible conflict of interest. Republicans have long called into question the ability of a Democratic-led Department of Justice to conduct an independent investigation into Hillary Clinton’s...