So who gets to cover the rest of what they were "promised"??
Easy, the government spent their FICA taxes as soon as it got them, instead of saving the money as it should have, so properly speaking, the money *should* come out of the “government’s hide”.
That is, large and illegitimate parts of the federal government were created with that money. By shutting them down, the government will likely have a surplus annual budget. And the trick they used of saying as long as they can pay just what is needed that month and they are still solvent, still applies.
So the promises will be kept.