Do you think the government would have plans for such a devastating event that it, being the government, would cease to have any power to control the populous? Do you think that the government would publicize such things that would certainly heighten the anxiety of their servants? I think no.
An emp attack in concert with nuking cities and other strategic locations in our country would bring things to a complete halt. Those officials and the elite will be well taken care of in our tunnel systems. The rest of the population would be on their own.
You read too many doomer sites.