The US midterm election results have injected major uncertainty into the direction of economic policy during Trump's second term.
The Democratic Party has swept both chambers of Congress, and while it cannot directly halt executive powers such as tariffs and immigration enforcement, it will use budget approval and debt ceiling negotiations to pressure the White House, reshaping this policy battle over inflation and the cost of living.
Oregon Senator Ron Wyden, elected chairman of the federal Senate Finance Committee, said in a statement on Wednesday that the committee will advance tax reform, push healthcare legislation, and "reaffirm Congress's power over trade policy" 鈥?a direct jab at the Trump administration's practice of bypassing Congress to impose tariffs.
Natixis Chief US Economist Christopher Hodge pointed out that Democrats "can credibly threaten to shut down the government or refuse to raise the debt ceiling in exchange for concessions," covering areas including restoring healthcare tax subsidies cut during Trump's term.
This shift in the power landscape will directly affect financial market expectations regarding the Federal Reserve's policy path, fiscal spending trends, and the tariff outlook, and could trigger a new round of market volatility in debt ceiling negotiations over the coming year.
Government Shutdown and Debt Ceiling Are the Core Bargaining Chips
At the time Democrats take control of Congress, the US economy remains broadly resilient 鈥?the unemployment rate stands at 4.2%, and third-quarter annualized growth rebounded strongly to 3.4%.
However, inflation remains stubbornly above the Federal Reserve's 2% target and continues to rise, driven by multiple factors including Trump's tariff policies, the Iran war shock, and the wave of AI infrastructure construction.
Against this backdrop, budget legislation and the debt ceiling have become the most powerful weapons in the Democrats' hands.
Congress holds the power of the purse over government agencies' appropriations bills, which can be used to reshape or restrict the functional scope of specific agencies 鈥?whether immigration enforcement, CDC operations, environmental deregulation, or Defense Department personnel changes can all be constrained through appropriation provisions.
Columbia Threadneedle global rates strategist Ed Al-Hussainy, citing historical precedents, noted that the budget agreement reached after Republicans took control of Congress during Clinton's first term, and the spending cuts pushed by Republicans after winning the House in 2010, are both examples of how "midterm elections quietly become turning points in fiscal policy."
He believes the "natural pressure point" of this policy battle will come during debt ceiling negotiations expected to begin later next year.
It is worth noting that Trump holds veto power, and the Democrats' majority is insufficient to override his decisions.
But Al-Hussainy also stressed that "the notion that 'divided government leads to policy paralysis' does not withstand any serious scrutiny" 鈥?potential room for compromise could cover Medicaid cuts, as well as data center investment subsidies and tax policies of concern to several states now included in Democratic territory.
Democratic Landslide May Push the Fed Toward a More Hawkish Stance
The Democratic majority in Congress will also change the political environment in which the Federal Reserve operates. According to Reuters, the new Democratic majority may push the Fed toward more aggressive inflation control measures through congressional oversight functions, and take a more skeptical view of the judgment that AI expansion will bring deflationary effects.
Behind this shift is a direct catalyst at the AI policy level. In key states such as Texas, voters elected Democratic governors who promised stricter regulation of rapid AI expansion, and the booming local data center construction wave may cool as a result.
This has implications for the inflation path 鈥?it is precisely the massive investment in AI infrastructure that is currently driving up prices for industrial raw materials, specialized technical labor, and electricity.
Trump has touted deregulation as a path to maintaining high growth without raising prices.
However, most economists believe the net effect of his overall policy mix is uncertain: deregulation may lower business costs, but tariff policies, the Iran war, and immigration controls that shrink labor supply have collectively pushed up inflationary pressures. Democrats can now systematically hold the administration accountable on these issues.
Focus on Livelihoods: Cost of Living Will Be the Main Axis of Contest
Extending the logic of campaign issues, the core of this policy battle will likely still rest on the spark that initially ignited this election 鈥?the cost of living.
Christopher Hodge's analysis points out that "key policies that can be implemented quickly, such as trade policy and foreign policy, remain concentrated in the executive branch, where President Trump's power is largely unconstrained."
This means that Democrats will rely more on indirect pressure rather than direct legislative intervention on issues that directly affect consumer-side inflation, such as tariffs and energy prices.
Meanwhile, Ron Wyden explicitly listed "requiring the super-rich and corporations to pay their fair share" as the core tax agenda of the Senate Finance Committee, signaling that Democrats will seek greater political initiative in the narrative of tax fairness.
How to convert congressional leverage into substantive policy concessions is the key test facing the new Democratic congressional leadership. For the market, this process itself 鈥?especially the negotiation battles over the debt ceiling and government shutdown 鈥?will be the macro risk variable most worth tracking over the coming year.
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