So... what's the best way to protect oneself and one's retirement from the all-but-inevitable default on the national debt?
@Timocracy talk to a financial adviser if you have unusual circumstances but literally doing nothing is quite likely the best option for the vast majority of people.
Retirement savings are by definition very long term and default, while possible, is definitely short term. It’s not like accounts will go to 0, expected cash flows on impacted bonds will accrue and get paid later.