Maddow reacts to report of Russian oligarch paying for Trump Jr.'s lavish wedding weekend

Rachel Maddow shares details of new reporting from ProPublica that Donald Trump Jr.'s lavish weekend wedding celebration was largely paid for by a "very generous" Russian oligarch who even helped plan the festivities despite there being some questions about just how well he knows the couple or what he might expect in return for his generosity. Brett Murphy, investigative reporter with ProPublica, joins to talk about the report.