[Lawgvr1955]

This is a non-starter in my humble opinion. If there were an attack like that on the center of government, I imagine the surviving chief executive would declare martial law. There would be plenty of times for elections as the government wouldn't lift martial law for some time.

[PoorMuttly]

Yes, there would be Martial Law.

That pretty much settles the question. It would be the best way of dealing with an obviously military situation. We won't need to legislate pork for a long time thereafter...but we will need to stabilize the place...

...and pass the ammunition. Should be a colorful time.