That bomb, if approved by Congress, could obliterate an area of approximately 15,360 square miles, completely. The Hiroshima bomb would have wiped out all of Houston, if used on a comparable population in the United States.
The proposed bomb would destroy the United States, Canada, and the Mexican Peninsula. The resultant radiation and fallout would poison both the Atlantic and the Pacific oceans. The Nuclear Winter would kill all plant life on earth.
I hope you've got your survival greenhouses set up in the deepest caves on earth.