A few weeks ago, footage showing asylum seekers, including young children, being rounded up, taken to sea and abandoned on a raft by the Greek Coast Guard was sent to The New York Times. Matina Stevis-Gridneff, The Times’s bureau chief in Brussels, discusses how she proved the truth of the tip that a major European government was carrying out an illegal scheme risking the lives of civilians. Guest: Matina Stevis-Gridneff, the Brussels bureau chief for The New York Times.