Congress Faces Uncertainty Over Trump's 1.5 Trillion Defense Budget

The Trump administration's proposed $1.5 trillion defense budget faces significant uncertainty as Congress prepares for the November 3 midterm elections. Lawmakers must determine how to finance national defense for fiscal year 2027 while navigating competing political priorities and a December government funding deadline.

According to the Center for Strategic and International Studies (CSIS), the proposal includes $1.15 trillion in base discretionary defense appropriations and another $350 billion through budget reconciliation. The administration also submitted a supplemental request of nearly $70 billion in June to cover expenses associated with the war with Iran and other defense activities.

Congress is currently operating under a continuing resolution that funds the federal government through December 11. Legislators must decide whether to approve full-year appropriations before that deadline or extend temporary funding through another continuing resolution.

The Washington Post reported that Defense Secretary Pete Hegseth discussed the proposal's congressional prospects with a Republican lawmaker during the summer. When Hegseth asked about the likelihood of securing congressional approval, the lawmaker compared the chances to Hegseth receiving Senate confirmation for the position a second time.

CSIS identified the upcoming elections as a major factor influencing the budget negotiations. If Democrats gain control of either chamber of Congress, they could prefer postponing negotiations until the new Congress takes office, potentially gaining greater leverage over government spending priorities.

Congress has limited time to complete the appropriations process. Following the elections, the Senate has 22 scheduled working days remaining, while the House has 20 before its planned adjournment.

In the House, the Military Construction and Veterans Affairs appropriations bill, H.R. 8469, has passed. However, the defense appropriations bill, H.R. 9495, has only cleared committee and still requires approval from the full chamber. Neither measure has passed the Senate Appropriations Committee, according to CSIS.

The House defense appropriations proposal currently provides approximately $1.072 trillion, broadly aligning with the administration's discretionary funding request. Meanwhile, allocations for military construction and family housing remain approximately $9 billion below the administration's requested levels.

Another unresolved issue is whether Republicans can secure the additional $350 billion through reconciliation. The House approved its fiscal year 2027 budget resolution, H. Con. Res. 113, in July, but the Senate postponed a vote on its corresponding measure.

Passing reconciliation legislation requires lawmakers to approve a budget resolution, assign funding instructions to relevant committees, develop legislation, and reconcile differences between House and Senate versions. The process could prove difficult with limited legislative days remaining after the elections.

Previous reconciliation efforts illustrate the time involved. The One Big Beautiful Bill Act, P.L. 119-21, took 85 days from budget resolution adoption on April 10, 2025, to enactment on July 4, 2025. The Secure America Act, P.L. 119-98, took 42 days from adoption of its fiscal year 2026 budget resolution to enactment.

CSIS also noted that disagreements within the Republican Party could prevent the administration from obtaining its full reconciliation request. If lawmakers approve substantially less than $350 billion or abandon reconciliation, they may attempt to incorporate additional defense priorities into regular appropriations legislation.

Delaying funding negotiations until 2027 could also connect government spending discussions with the federal debt ceiling. Projections cited by CSIS indicate that the government could reach its borrowing limit in early to mid-2027, although some Republicans and Democrats have suggested addressing the issue during the post-election congressional session.