No they don't. They don't have to. They do so in practice to manage inflation, but as they're pretty mcuh at the zero bound, the risk of default is greater than the risk of some inflation.
If the US wants to get out of debt, then Congress shouldn't pass a budget that they can't afford to pay. If the US defaults, the consequences are far worse than some more debt which the US has up until now always been able to pay for.
If the US wants to get out of debt, then Congress shouldn't pass a budget that they can't afford to pay. If the US defaults, the consequences are far worse than some more debt which the US has up until now always been able to pay for.