Lisbeth Gronlund, research affiliate with the Department of Nuclear Science and Engineering at MIT, joins Press the Button to discuss why it's so dangerous that the US president has the sole authority to order the use of nuclear weapons, and how to avoid future situations where unhinged presidents have their finger on the button. Early Warning features our program officer/nuclear field coordinator John Carl Baker and Catherine Killough of Women Cross DMZ on a new report outlining how a formal end to the Korean War could lower tensions and make room for progress on the North Korea nuclear issue, and what to expect from the Biden administration on North Korea.