I don't think the story is that simple when we're talking about a country that can print the currency that be debt is demarcated in.
A budget deficit means that the government has chosen not to print enough money to offset its spending. Now, the government printing its way to liquidity does have consequences, but fundamentally balancing the US federal budget is not like balancing a house budget.
And because the government can print the money at any time, it really doesn't matter how fast the interest is growing. What matters is whether people keep showing up to give the government the money.
A budget deficit means that the government has chosen not to print enough money to offset its spending. Now, the government printing its way to liquidity does have consequences, but fundamentally balancing the US federal budget is not like balancing a house budget.
And because the government can print the money at any time, it really doesn't matter how fast the interest is growing. What matters is whether people keep showing up to give the government the money.