Conclave Begins: Cardinals Gather to Elect Successor to Pope Francis

Following nine days of mourning after Pope Francis's funeral, the focus now shifts to finding his successor. Today, 133 Catholic Cardinals will gather behind the locked doors of the Sistine Chapel for the start of the highly-secretive conclave, a centuries-old process to elect the next leader of the Catholic Church. NBC's Jay Gray reports from the Vatican, providing a closer look at the conclave process and its significance for 1.4 billion Catholics worldwide.