I suppose MIT and HArvard could allow students on campus but locked into their dorm rooms. They could have the bathroom police unlock doors individually so the kids could take showers, etc. Then they could have the cafeteria deliver meals the same way prisoners are fed in their cells. Trump could extend this edict to the workplace as well - any VISA holders working remotely get deported. Somewhere in the mists of history I remember isolationism not working out too well for us. I wonder why we are going back there?