The takeaway from Hillary Clinton’s foreign policy speech Thursday in San Diego: it would be a historic mistake to elect Donald Trump. For 30 minutes, Clinton made a forceful case that Trump is more than just unqualified to become Commander in Chief, calling his foreign policy platform ‘dangerously incoherent’. Mark Landler, White House Correspondent for the New York Times and author of “Alter Egos: Hillary Clinton, Barack Obama and the Twilight Struggle over American Power,” joins us for analysis.