In the face of the changes to come, I have begun to worry less and less about what happens or is going to happen to the U.S. government. It's a dinosaur. All of the modern super-states are going to wither away, or re-organize at a drastically reduced level of complexity and energy input, during the 2020s as the Long Emergency begins to seriously bite down.
The U.S. debt will likely never be repaid. If you're under 45 or so, I also would not count on Social Security in any form. My advice is to study the lifeways of civilizations that did not enjoy a cheap-oil energy bonanza. Prepare for a pay-as-you-go economy with your extended kin, your community and "tribe" as your "security" source...in other words, a return to what has been the norm for better than 99.9% of the human race's tenure here on Earth.