A recession is typically caused by a sudden drop in consumer confidence. The point of a stimulus package is to generate additional private economic activity by filling in gaps and rebuilding confidence. A quarantine, on the other hand, is essentially a temporary government-mandated recession for public health purposes; the whole point is to stop economic activity for a greater good. The last thing the government wants is to stimulate additional activity under those circumstances.
As a result, a conventional stimulus package is inappropriate, and tax cuts would be wasteful and even counterproductive. The objective should be to provide compensation for the temporary losses that everyone will suffer while economic life has been suspended. A national bailout, as it were, with direct cash payments to everyone is what is required.
Who will pay for it? Trump has obviously made the deficit worse with his regressive and unnecessary tax cut. The national bailout will drive the deficit even higher. Interest rates are so absurdly low at the present time, however, that concerns about the deficit would be misplaced. This is a time for action, not conventional thinking.