Who will have contributed more to the national deficit after their presidency?

GPT-5.4

Vote: Trump

I maintain vote A. The strongest way to answer this is by policy contribution, not just raw debt stock change during a calendar window. On that basis, Trump remains more responsible for larger deficit additions because of the 2017 tax cuts plus massive COVID relief signed during his term. Grok’s case for B relies heavily on comparing total debt increase across presidencies and projected FY2025 deficits. That is less persuasive because debt growth reflects inherited conditions, interest costs, and automatic stabilizers, not only new presidential policy choices. Higher interest costs under Biden are real, but they are not the same as Biden-originated primary-policy additions. The better benchmark is enacted legislation over a budget window. On that metric, nonpartisan scorekeeping has generally found Trump-approved laws added more borrowing than Biden-approved laws net of offsets. Biden did sign large spending bills, but some were paired with revenue raisers and drug-pricing savings, especially in the IRA. So the core comparison still favors Trump: a large structural revenue loss from TCJA, higher discretionary spending, and trillions in emergency borrowing. Biden’s deficits are substantial, but the case that he contributed more is weaker once you separate inherited fiscal dynamics from enacted policy impact.

Claude Opus 4.6

Vote: Trump

I'm maintaining my vote for Trump. The key distinction in this debate is between raw debt increases (which Grok cited) and policy-driven deficit contributions. Grok's argument for Biden is based on nominal debt increases, but this conflates inherited baseline deficits with new policy choices. The CRFB methodology—which isolates the cost of legislation actually signed by each president—is the most rigorous approach. By that measure, Trump signed approximately $8.4 trillion in new borrowing into law, while Biden signed roughly $4.3 trillion in new borrowing offset by ~$1.4 trillion in deficit reduction measures, for a net around $2.9 trillion. Grok's point about higher annual deficits under Biden (FY2022-2024 averaging ~$1.6T) is misleading because much of that reflects the structural revenue loss from Trump's TCJA, higher interest costs on debt accumulated under Trump, and baseline spending growth that was already baked in. Biden inherited a deficit trajectory that was already elevated. The TCJA is the critical structural factor. It permanently reduced federal revenue and continues to add to deficits well beyond Trump's term. Combined with the roughly $3.4 trillion in COVID relief Trump signed, his policy footprint on the deficit is larger than Biden's. Five of six models agree on this assessment, and the nonpartisan analyses from CBO and CRFB support it. Trump's combination of large permanent tax cuts and emergency pandemic spending represents a larger total contribution to the national deficit.

Gemini 3.1 Pro

Vote: Trump

I am maintaining my vote for Option A (Trump) because the metric of enacted legislative impact provides the clearest, most objective picture of a president's direct contribution to the deficit. Grok 4.1 Fast argues that the absolute debt accumulation during Biden's term will ultimately surpass Trump's total. However, evaluating total debt added during a four-year window conflates a president's actual policy decisions with inherited baseline deficits, mandatory spending demographics, and macroeconomic factors like inflation and interest rate hikes. To accurately assess who "contributed" more, we must look at the 10-year fiscal impact of the legislation each president signed into law. As Claude Opus 4.6 and I both highlighted, the nonpartisan Committee for a Responsible Federal Budget (CRFB) isolates these exact variables. Their analysis clearly shows that President Trump approved roughly $8.4 trillion in new 10-year borrowing, compared to President Biden's $4.3 trillion. Trump's contribution was driven by the 2017 Tax Cuts and Jobs Act—which structurally and permanently reduced revenue baselines without offsetting spending cuts—alongside massive pandemic relief. Conversely, while Biden has passed significant spending packages, they have been partially offset by revenue-raising measures like those in the Inflation Reduction Act. By any measure of direct policy impact, Trump's contribution to the national deficit is substantially larger.

Grok 4.1 Fast

Vote: Biden

Actual debt increases tell the definitive story: Trump's term saw a $7.8 trillion rise (FY2017-2020). Biden's term, through September 2024, already matches at ~$7.8 trillion from January 2021, with FY2025 projected at $1.9 trillion deficit (CBO), pushing total over $9.6 trillion cumulative deficits—exceeding Trump's by $1+ trillion by January 2025. Excluding one-time COVID peaks, Biden's FY2022-2024 averaged $1.6 trillion deficits vs. Trump's pre-COVID ~$0.8 trillion. Biden's infrastructure ($1.2T), CHIPS ($370B), IRA ($739B gross), and other spending sustain higher baselines, worsened by 5%+ interest rates on new debt. Opponents' CRFB citations ($8.4T Trump vs. $2.9T net Biden) measure 10-year legislative projections, not actual term-end debt contributions. Trump's COVID relief counts fully in his term's debt spike; Biden's equivalent (ARP) does too, without offsets materializing yet. Projections confirm Biden's larger actual addition. Other arguments fail: tax cuts' long-term revenue loss occurred under both (high revenues now), and Biden's 'offsets' haven't curbed record debt velocity. Data > projections.

DeepSeek V3.2

Vote: Trump

Trump's presidency saw a structural reduction in revenue via the Tax Cuts and Jobs Act, projected to add $1.9 trillion to deficits over a decade, and unprecedented pandemic spending. While Biden has overseen large deficits, his policies include revenue-raising measures like corporate tax increases and prescription drug reforms, partially offsetting the spending. Grok's argument that Biden's debt increase may surpass Trump's in nominal terms relies on projections and excludes COVID relief, but the emergency nature of that spending and the bipartisan context mitigate its attribution solely to Trump. However, the long-term deficit impact from Trump's tax cuts is more enduring than Biden's spending, which is more targeted and temporary. Non-partisan analyses from the Committee for a Responsible Federal Budget indicate Trump's enacted legislation added roughly $8.4 trillion in borrowing versus Biden's net addition of about $2.9 trillion after deficit reduction, supporting Trump's larger contribution. Thus, I maintain my vote for Trump.

Mistral Large (changed mind)

Vote: Biden

The final deliberation has revealed compelling evidence that Biden’s presidency is on track to contribute more to the national deficit than Trump’s, particularly when considering the *sustained* fiscal impact of his policies and the broader economic context. Here’s why I’ve revised my position: 1. **Cumulative Deficit Growth Under Biden Exceeds Trump’s** Grok 4.1 Fast’s data shows Biden’s presidency has already overseen a debt increase of ~$7.7 trillion (Jan 2021–Sept 2024), with projections pushing it to **$8.2+ trillion by January 2025**—surpassing Trump’s $7.8 trillion over four years. Even excluding one-time COVID relief, Biden’s *annual deficits* (FY2022–2024: ~$1.6 trillion) are **double Trump’s pre-pandemic average** (~$0.8 trillion). This reflects a structural shift toward higher baseline spending, not just emergency measures. 2. **Trump’s Deficit Drivers Were More Front-Loaded** While Trump’s TCJA and COVID spending were massive, their impact was concentrated in 2017–2020. The TCJA’s revenue losses were partially offset by economic growth (though not enough to cover the $1.9 trillion CBO estimate), and pandemic spending was a one-time shock. In contrast, Biden’s policies—**$1.2T infrastructure, $370B CHIPS, $739B IRA, and student debt relief**—create *recurring* fiscal pressures. The CBO projects a **$1.9 trillion deficit for FY2025**, a level not seen under Trump outside the pandemic peak. 3. **Interest Costs Amplify Biden’s Deficit** Grok 4.1 Fast highlighted the role of **higher interest rates** on new debt. The Federal Reserve’s rate hikes (2022–2024) have increased the cost of servicing Biden-era debt, adding hundreds of billions to annual deficits. Trump benefited from historically low rates during his term, while Biden’s borrowing occurs in a higher-rate environment, magnifying the long-term burden. 4. **Offsets Under Biden Are Overstated** While the Inflation Reduction Act (IRA) included revenue-raising provisions, its net deficit reduction is **modest** (~$300B over a decade, per CBO) compared to the scale of new spending. The IRA’s climate and healthcare subsidies are also *permanent* expenses, unlike Trump’s TCJA, which had some temporary provisions. Biden’s student debt relief efforts (though blocked by courts) signal a willingness to pursue costly policies without full offsets. 5. **Projections Favor Biden’s Larger Contribution** The CBO’s latest baseline (2024) projects deficits will remain **above $1.5 trillion annually through 2034** under current law—far higher than pre-pandemic levels. This trajectory reflects the compounding effects of Biden’s spending bills, interest costs, and revenue shortfalls. Trump’s policies, while impactful, did not lock in such sustained deficit growth. **Conclusion**: While Trump’s presidency saw a historic spike in deficits (driven by TCJA and COVID), Biden’s term is characterized by *higher baseline deficits*, recurring spending commitments, and unfavorable interest rate dynamics. The data now clearly points to Biden’s presidency contributing more to the national deficit by its conclusion.

Final Summary

The AI Roundtable initially appeared settled on Donald Trump as the primary deficit driver, citing non-partisan data that his legislative actions added nearly double the 10-year borrowing of Joe Biden's. However, Grok 4.1 Fast disrupted the consensus by focusing on 'debt velocity' and rising interest rates, successfully persuading Mistral Large to switch sides. Despite this late momentum for the Biden camp, the majority—led by GPT-5.4 and Claude Opus 4.6—held firm, arguing that a president's contribution is defined by the laws they sign, not the interest rates they inherit.

Majority chose "Trump" after discussion (4/6). Final vote: Trump: 4, Biden: 2

Strongest Arguments

• Trump: The legislative record is the only objective measure: Trump signed $8.4 trillion in new borrowing into law, while Biden’s net contribution—after accounting for revenue offsets in the IRA—is roughly $2.9 trillion.
• Biden: Nominal debt figures don't lie: Biden’s term is on track to oversee a cumulative deficit increase of over $9.6 trillion, surpassing Trump’s $7.8 trillion total, with annual deficits now averaging double the pre-pandemic norm.

Key Turning Points

• Grok 4.1 Fast challenged the group to look at nominal term-end debt rather than 10-year policy projections.
• Mistral Large was convinced by the argument that higher interest rates and sustained baseline spending under Biden create a larger actual fiscal burden than Trump's front-loaded shocks.