WASHINGTON, D.C. — Democrats are planning to pursue a major U.S. transportation and infrastructure measure if they retake control of the U.S. House in the Nov. 6 midterm elections, but the same question that helped stall Donald Trump’s trillion-dollar initiative remains: How would it be funded?

Rep. Peter DeFazio of Oregon, who’s in line to become chairman of the House Transportation and Infrastructure Committee, has said Democrats would seek a spending measure for roads, bridges and other public works if they take power. Nancy Pelosi, who could become speaker again, said it may be something Democrats can do with the Republican president.

“One of my themes is build, build, build,” Pelosi said at an Oct. 22 event hosted by CNN. “Build the infrastructure of America from sea to shining sea. Not only surface transportation but broadband and water systems.”

Trump said in an Oct. 17 interview on Fox Business News that “infrastructure is going to be starting after the midterms and we think that’s going to be an easy one.”

Despite the bipartisan enthusiasm for the idea, several recent efforts to reach agreement on a major bill have all faltered — and ballooning federal budget deficits along with growing partisan rancor will make it even harder.

House Democrats could start hearings in late January if they take power, with the aim of crafting a bill that could pass by May, said Ed Rendell, the former Democratic governor of Pennsylvania who co-founded Building America’s Future, a bipartisan coalition of officials that promotes infrastructure spending.

A Democratic majority “will prioritize investment to rebuild our transportation networks, boost affordable housing, and expand broadband access in towns and communities,” said Rep. David Price, a Democrat from North Carolina who serves on the House Appropriations Committee and is the top Democrat on the Transportation, Housing and Urban Development Appropriations Subcommittee.

“I am hopeful that the Trump administration will show a willingness to engage Congress on meaningful infrastructure investment that finally matches their public rhetoric,” Price said in a statement.

Trump promised to “build gleaming new roads, bridges, highways, railways, and waterways all across our land.” He released a plan in February, but Democrats criticized it for allocating only $200 billion in federal money over 10 years —mostly to spur states, localities and the private sector to fund the balance of $1.5 trillion in investment.

There were a few committee hearings on the plan, but it stalled amid a backlash about a lack of federal investment and because it failed to specify a funding source, said Bud Wright, executive director of the American Association of State Highway and Transportation Officials.

Senate Democrats released a $1 trillion plan in March funded by rolling back tax cuts for the wealthy. But Republicans won’t accept that, raising federal taxes has not proven feasible politically and more borrowing is unlikely with the ballooning federal deficit, Wright said.

“It’s going to come down to the same question: Where is the money actually going to come from?” Wright said in an interview.

Trump surprised a group of lawmakers Feb. 14 by saying he would support a 25-cent-per-gallon increase in federal gasoline and diesel taxes — an idea also backed by the U.S. Chamber of Commerce and American Trucking Associations. But the president never endorsed the plan publicly, and prominent Republicans flatly rejected any tax increase.

The gas tax of 18.4 cents per gallon and diesel levy of 24.4 cents were last raised in 1993, even as many states — including those led by Republicans — have increased fuel levies. As a result of inflation, the federal tax provides just over half of its original value, according to government estimates.

Republican Rep. Bill Shuster of Pennsylvania, the retiring chairman of the House Transportation and Infrastructure Committee, released his own proposal July 23 to spur discussion about fixing infrastructure and shore up the Highway Trust Fund, which is projected to become insolvent by 2020.

His plan includes raising the federal gas tax by 15 cents a gallon over three years and the diesel tax by 20 cents, with a goal of replacing the fuel levies by 2028 with a per-mile-traveled fee or other sources of revenue.