Feuding clouds South Korea presidential election

South Korea's conservative ruling party is lurching from one crisis to another. It lost its president to impeachment following a months-long scandal over an ill-fated martial law declaration, and is now beset by infighting over who should replace him. With campaigning underway for a snap June election, the party finds itself in disarray against an increasingly emboldened opposition. NHK World's Aoki Yoshiyuki, a former Seoul bureau chief, explains.