The African nations of Niger and Chad have both been key partners with the United States in combating terrorist groups in the region. But now that both countries are ruled by military regimes, that cooperation is in question. Ali Rogin speaks with J. Peter Pham, former U.S. ambassador and special envoy for the Sahel region, to learn more. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders