Democrats swept Republicans out of both the House and the Senate in Tuesday's elections — and the incoming Senate class, whose terms run to January 2033, will be sitting when Social Security's retirement trust fund is exhausted in 2032.

That collision defines the next Congress. Each new legislator will face a choice among three options: allow an automatic 22% cut to Social Security benefits, restructure the program's outdated design, or borrow trillions more to prevent any cuts at all. Veronique de Rugy, the economist whose analysis frames the post-election fiscal picture, noted that few if any candidates "said a substantive word about it while campaigning."

Fiscal sustainability was largely absent from the entire campaign season. As late as 2018, 140 political ads mentioned the debt or budget deficit, according to AdImpact data reported by The Wall Street Journal. This cycle, only 30 ads touched the subject — ranking it 52nd among campaign topics.

What do the numbers show?

The arithmetic behind that silence is stark. In the fiscal year that just ended:

• Debt held by the public reached 100% of GDP, a level last seen after World War II.
• The deficit ran to nearly $2 trillion, or 6.2% of GDP.
• Interest payments have more than doubled in four years and now exceed the entire U.S. military budget.

The Treasury's short average debt maturity is accelerating the squeeze. About one-third of marketable debt — more than $10 trillion — must be refinanced within the next 12 months, and it will roll over at current rates rather than the lower rates at which much of it was originally issued. Interest payments, in other words, will keep climbing even if the deficit itself stabilizes.

The 30-year Treasury yield now sits near 5.31%. The Iran war explains part of that move, but investors are also charging more because they see a government and a Congress with no plan to back the debt with future surpluses.

How did the debt get here?

Public debt stood at roughly $10 trillion, or 65.5% of GDP, in 2011. Today it stands at $32.6 trillion, or 100% of GDP — more than tripled in dollar terms in twelve years.

De Rugy argues the current moment is exactly what fiscal hawks warned about fifteen years ago, when "we all got the same pat on the head." Interest rates were historically low then, and markets absorbed every bond the Treasury issued. Economists including Olivier Blanchard and Jason Furman built the intellectual case that debt carried no real cost as long as interest rates stayed below growth rates — and many assumed that condition, and the defeat of inflation, would hold indefinitely.

The warning was never about borrowing cheaply, de Rugy writes. It was about what followed: normal rates applied to a much larger debt. Low rates "were never a law of nature."

Who bears responsibility?

In her telling, nobody escapes blame. Republicans in the last two years cut some spending, then cut taxes by more. President Donald Trump promised $5,000 checks to every adult — a $1.2 trillion cost — if his party kept control of Congress, and the GOP has adopted Trump's rule that the two largest debt drivers, Social Security and Medicare, are off-limits.

Democrats, for their part, want to reverse recent Medicaid savings and restore expanded Obamacare subsidies while opposing any structural reform of Medicare and Social Security. Their pledges to raise taxes on the rich amount, in de Rugy's framing, to a European-sized welfare state funded by perhaps 2% of taxpayers.

Voters do not get a pass either. Polls show Americans worry about the debt, yet few accept the necessary spending restraint. "Interest costs and trust-fund expirations won't care who won on Tuesday," de Rugy writes.

Can taxes close the gap?

Revenue tells its own story. Federal tax collection has hovered around 17% of GDP for the last half-century, including eras when income-tax rates were far higher than today. Spending has climbed from about 18% of GDP in the 1960s to more than 23%, with the growth concentrated in programs for the elderly.

Closing the tax code's carve-outs for special interests would help, but de Rugy's conclusion is blunt: no path to sustainability avoids cutting or slowing the growth of benefits, raising eligibility ages to reflect longer lifespans, and putting Medicare on a budget.

The new class of senators must now deal with that reality. She wishes more voters had asked them how.