One Big Beautiful Bill Act supplemental defense, border security, and homeland security funding expires

The One Big Beautiful Bill Act included roughly $150 billion in supplemental funding for Department of Defense, DHS border security and ICE operations, and Coast Guard programs, authorized through September 30, 2029. This includes funding for border wall construction, deportation operations, detention facility expansions, and military procurement. Without reauthorization, these programs revert to their baseline discretionary appropriations levels, which are significantly lower. The expiration creates a built-in political pressure point that will shape appropriations debates beginning in FY2029.