Amid growing frustration that President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE's infrastructure package keeps getting pushed to the back burner, some members of Congress are taking matters into their own hands.

A bipartisan coalition from the Senate Commerce, Science and Transportation Committee has been discussing pushing its own bill if the administration doesn't release something by the fall.

The Senate Environment and Public Works (EPW) Committee has also been gathering input with an eye on drafting an infrastructure plan this summer.

And several Republicans met at the White House last week to try to get the ball rolling there on the issue.

“If Donald Trump fails to demonstrate leadership, Congress is just going to have to grab the rope,” Sen. Richard Blumenthal (D-Conn.) told The Hill. “There’s already been discussions among us, both Republicans and Democrats, about coming together [on infrastructure.]”

“Time is not on our side,” he added.

The ramped up effort comes as it appears more and more likely that Trump’s infrastructure proposal, which was once labeled as a 100-day priority but has yet to be released, won’t see action in Congress until next year.

GOP leaders have already signaled that infrastructure must wait on the sidelines until they tackle tax reform, which is likely to be a heavy lift.

And the White House piled another legislative item onto lawmakers’ plates this week, with its release of a sweeping bill to overhaul immigration laws.

The addition of immigration legislation is further dimming hopes that the rebuilding plan will move on Capitol Hill this year.

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“Clearly, the administration is putting a big priority on things like immigration as well,” Sen. John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.), chairman of the Transportation committee and the Senate’s No. 3 Republican, told reporters on Thursday. “Infrastructure more than likely, in my view, spills into next year based on how long it’s going to take to do tax reform.”

White House press secretary Sarah Huckabee Sanders said Monday that Trump remains committed to working with Congress on an infrastructure package.

The president also defended his decision not to put a rebuilding proposal at the top of the agenda, telling The Wall Street Journal it would have been a “waste” because it’s a bipartisan issue.

“A lot of people said you should have started with taxes or you should have started with infrastructure,” Trump said, according to a transcript obtained by Politico. “Well, infrastructure, I’ll actually have bipartisan support, and I can use infrastructure to carry other things along. So I don’t want to waste it at the beginning.”

But members of Congress who were initially excited by Trump’s vow to upgrade U.S. roads, bridges, airports and other public works are growing impatient.

“He said he wanted to make it a priority when he first came into office, and here we are, now into August,” Sen. Gary Peters (D-Mich.) told The Hill. “So it’s very frustrating that nothing has come forward, because our caucus is united that we want to do something.”

Now, some senators are exploring a plan B.

Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.) said the idea is to identify some bipartisan rebuilding bills and try to push a package through Congress, a process that lawmakers have already started.

One potential measure that is ready to go – and which Blumenthal said could be included in an infrastructure package – is from Sens. Roy Blunt Roy Dean BluntCDC tells Congress it urgently needs billion for vaccine distribution On The Money: Trump undercuts GOP, calls for bigger COVID-19 relief package | Communities of color hit hardest financially by COVID-19 | Businesses, states pass on Trump payroll tax deferral Trump undercuts GOP, calls for bigger COVID-19 relief package MORE (R-Mo.) and Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.).

The legislation, sponsored by five Democrats and four Republicans, would create a new infrastructure financing authority to help states and localities better collaborate with the private sector on rebuilding projects.

“I think our best bet right now is to work across the aisle in the Senate, regardless of what the White House does,” Klobuchar told The Hill. “This is going on now. People want to move.”

Sen. John Barrasso John Anthony BarrassoOVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium Senators reach compromise on greenhouse gas amendment stalling bipartisan energy bill The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump, Biden battle over vaccine, economy; Congress returns MORE (R-Wyo.), who chairs the EPW committee and serves on the Republican leadership team, said his panel has also been forging ahead with its own bipartisan blueprint for infrastructure.

The committee has held hearings on infrastructure funding options, the permit approval process and public- and private-sector roles in building projects.

Initially, Barrasso had hoped to release a bill this summer, but he told The Hill before leaving town for the August recess on Thursday that it wasn’t ready yet.

“I’ve been meeting with [EPW ranking member Tom Carper Thomas (Tom) Richard CarperDemocrat asks for probe of EPA's use of politically appointed lawyers Overnight Energy: Study links coronavirus mortality to air pollution exposure | Low-income, minority households pay more for utilities: report OVERNIGHT ENERGY: Democrats push resolution to battle climate change, sluggish economy and racial injustice | Senators reach compromise on greenhouse gas amendment stalling energy bill | Trump courts Florida voters with offshore drilling moratorium MORE (D-Del.)] about it,” Barrasso said. “Our staffs are working together.”

While some lawmakers, especially in the House, have been reluctant to get ahead of the administration, others have been in a rush to get something done on what they say is a time sensitive issue.

For one thing, infrastructure improvements can cost more the longer a project goes without a fix. And lawmakers have expressed concern about getting a bill done in time for construction season, which typically starts in the spring.

Members may also be eager to score a legislative victory that they can point to during the midterm elections, especially after the latest healthcare defeat in the Senate.

Blumenthal acknowledged that it would be unusual for Congress to move ahead with a massive infrastructure package without the president, though he said it might be necessary if they don’t see progress by “early fall.”

“It would be unprecedented for a program of this scale and scope to be bereft of presidential leadership,” he said.

But not everyone has given up hope on Trump’s ambitious rebuilding promise just yet.

A small group of Senate Republicans had a lunch meeting at the White House last week with DJ Gribbin and Reed Cordish, two of Trump’s policy aides.

Sen. Jim Inhofe James (Jim) Mountain InhofeChamber of Commerce endorses McSally for reelection Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Top admiral: 'No condition' where US should conduct nuclear test 'at this time' MORE (R-Okla.), who was at the gathering, said lawmakers are trying to prod the administration into action and help determine the best path forward on the issue.

He said the White House has still not decided when it will deliver an infrastructure bill to Capitol Hill, but hopes their voices will help make a difference.

“I’m among others that are pushing hard to do it sooner rather than later,” Inhofe told The Hill. “We have a lot of bipartisan support.”