Krish O'Mara Vignarajah, president and CEO of Lutheran Immigration and Refugee Service (LIRS), joins Press the Button to discuss the intersection of immigration and national security, and how the work of LIRS makes us safer. Early Warning features our deputy policy director Mary Kaszynski and Daryl Kimball of the Arms Control Association on the veracity of reports that Russia and China have conducted nuclear tests, and the latest news on US-Iran tensions. Joe Cirincione answers a question on nuclear close calls.