WASHINGTON—Speaker Mike Johnson's proposed budget met decisive opposition from within the Senate Republican conference this week, as key conservative senators moved immediately to block it.

Rand Paul of Kentucky and Mike Lee of Utah led the resistance. The House plan, which would cut $1.5 trillion in federal spending over 10 years, failed to gain traction with the upper chamber's fiscal hawks, jeopardizing the appropriations process.

The Senate opposition stems from a divide over both the scope of cuts and defense spending. Paul called the proposed cuts "insufficient" at a Wednesday press conference, arguing for deeper reductions in non-defense discretionary spending. Major defense contractors—including Lockheed Martin, Raytheon and Boeing—spent more than $15 million combined on lobbying in the first quarter of 2026, according to OpenSecrets filings, directly pushing for stable or increased Pentagon budgets.

The rejection hands a victory to the Senate's more traditional conservatives, who want a robust defense budget while still trimming elsewhere. Johnson's House GOP loses early leverage in appropriations talks and now faces a strategic recalibration. The standoff raises the odds of a short-term continuing resolution to fund the government past Sept. 30, pushing difficult spending decisions into late 2026 and potentially into the lame-duck session.

The gridlock complicates efforts to pass all 12 annual appropriations bills before the fiscal year ends—a goal Congress frequently misses. President Trump's administration has urged lawmakers to avoid another omnibus spending package, pushing instead for individual bills to increase transparency and accountability. The Senate is now expected to craft its own spending framework, likely leading to protracted negotiations with the House and the White House through the fall.

The dispute directly affects federal agency funding across a range of programs. The Environmental Protection Agency and the Department of Education—frequent targets for conservative cuts—face funding uncertainty. Defense-related programs, backed by heavy lobbying, may see their funding protected or increased in a separate Senate proposal.