A June 3 letter from Sen. Ed Markey (D-Mass.) and 15 other Senate Democrats urged leaders of the Senate Environment and Public Works, Commerce, Banking and Appropriations committees to include protections against what they described as political interference in transportation funding, arguing that grant cancellations and delays have undermined confidence in the federal infrastructure program.

"The next surface transportation bill must include protections for existing and future grant funding against inappropriate political interference," the letter states, in part.

They also argued that Congress cannot have confidence in a new bipartisan transportation package if the administration is not faithfully implementing laws already on the books.

The House Transportation and Infrastructure Committee approved the five-year BUILD America 250 Act in May, but the Senate has not yet released its own reauthorization proposal. With current surface transportation authorities set to expire Sept. 30, lawmakers face a compressed timeline to develop Senate legislation and negotiate a final package.

The letter arrives before Senate committees have released draft legislation, giving Democrats an opportunity to influence the debate before it advances to a floor vote.

Funding Disputes Move from Policy Debate to Project Delivery Risk

For project sponsors, the issue is not theoretical. Earlier this year, the Gateway Development Commission sued the federal government after reimbursements tied to the $16-billion Hudson Tunnel Project were frozen.

Officials later reported the funding interruption cost millions of dollars, delayed major contract awards and created new risks for construction sequencing and procurement timing.

In Chicago, transit officials warned that a $2.1-billion federal funding freeze affecting the Red Line Extension and Red and Purple Modernization programs would force contractor demobilization and work stoppages on active construction projects. A federal judge later ordered funding restored, allowing work to continue.

The Metropolitan Transportation Authority separately sued the U.S. Dept. of Transportation for over $58.6 million in withheld reimbursements tied to the $7.7-billion Second Avenue Subway Phase 2 project, arguing that interruptions to federal payment flows threaten procurement sequencing, contractor payments and active construction progress.

Senate Democrats contend those disputes are symptoms of a larger problem. Their letter points to transit projects, road safety initiatives, electric vehicle infrastructure and other programs that have faced funding reviews, pauses or cancellations under the Trump administration.

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House Proposal Offers Guardrails, Critics Want More

The House Transportation and Infrastructure Committee's proposed BUILD America 250 Act already contains language aimed at addressing some of those concerns.

Section 1101(f) states that the transportation secretary may not "terminate, withhold, or delay the execution of a grant agreement" because an award no longer advances "non-statutory program goals or agency priorities," an apparent attempt to limit future administrations from revisiting previously awarded projects solely because policy priorities have changed.

The provision suggests lawmakers are already aware that grant administration itself has become a transportation policy issue. Critics argue the protections do not go far enough.

Stephan Davis, director of Transportation for America, argues the proposal does little to address grants that have already been canceled, rescinded or repurposed.

Instead, he says lawmakers should first address grants awarded under the Infrastructure Investment and Jobs Act that have since been canceled or had their funding withdrawn.

"The starting point should be, let's make sure that all these things that we agreed to before actually get done properly, and then come and talk to me about getting more of my money," Davis says.

Beyond funding levels and program priorities, a new question is emerging: Who controls transportation funding after it has been awarded?

"Congress cannot have confidence in a final bill—even one that is bipartisan and negotiated in good faith—if the Administration is actively failing to implement the laws already in place," the senators wrote.

House Transportation and Infrastructure Committee Republicans and the U.S. Department of Transportation did not immediately respond to requests for comment.

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An earlier version of this article incorrectly stated that the Gateway Development Commission estimated a prolonged funding disruption could add as much as $2 billion to project costs. The commission did not make that estimate.