WASHINGTON (AP) — President Donald Trump shot down a possible approach for raising revenue to finance tax cuts in politically must-do legislation for the Republicans, promising Monday the popular 401(k) retirement program will be untouched.

As Republicans hurtle toward producing a bill to overhaul the U.S. tax system, they’re scrambling to find new revenue sources to pay for anticipated tax cuts exceeding $1 trillion. A proposal to eliminate the widely-used federal deduction for state and local taxes has run into heavy opposition from GOP House members from high-tax states, threatening the enactment of tax legislation that Republicans deem essential to retaining their majority in next year’s elections.

Trump pledged in a tweet there will be “no change” to tax incentives for the 401(k) retirement programs.

The plan crafted by Trump and Republican leaders calls for steep tax cuts for corporations and potentially individuals, a doubling of the standard deduction used by most Americans, shrinking the number of tax brackets from seven to three or four, and the repeal of inheritance taxes on multimillion-dollar estates. The child tax credit would be increased and the tax system would be simplified; most Americans would be able to file their income taxes on a postcard, according to the plan.

Crucial details of the plan have yet to be worked out, notably what income levels would fit with each tax bracket.

With the possibility of the state and local deduction being at least partly preserved, some Republican lawmakers were considering limiting the amount workers could save in 401(k) retirement accounts.

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“It was a trial balloon and it crashed,” said Brian Riedl, a senior fellow at the conservative Manhattan Institute. “They’re struggling to find legitimate offsets” for tax cuts.

“Everyone has been promised they are going to be better off with tax reform and that’s really hard to do in a fiscally responsible way,” Riedl said.

Employees’ earnings from defined-contribution retirement plans such as 401(k)s aren’t taxed until retirement; pay-ins by both employers and employees also receive tax-preferred status. That cost the government $82.7 billion in lost revenue in the recent budget year — a potentially juicy target for Republican tax-cutters.

With 55 million U.S. workers holding some $5 trillion in their 401(k) accounts, the plans have become a touchstone of retirement security for the middle class.

“This has always been a great and popular middle class tax break that works, and it stays!” Trump tweeted. “There will be NO change to your 401(k).”

Rep. Diane Black, R-Tenn., the chairman of the House Budget Committee, said of the Trump-rejected proposal on retirement plans: “There are still some dials that do have to be turned. This is a major effort and when you dial one thing you have to look at another.”

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House Republicans will be working to pass a budget this week so they can turn their attention to the tax overhaul. Trump warned Sunday that action on tax reform is crucial to avoiding political failure in 2018. He’ll work to rally support for the plan at the Capitol Tuesday at a lunch with Senate Republicans.

Trump personally implored House GOP members on a conference call to swiftly adopt the budget that was passed last week by the Senate, with the hope of clearing the way for what he described as historic tax cuts.

Trump told the lawmakers they were on the verge of doing something historic, according to one Republican official, who, like others, spoke on condition of anonymity because they were not authorized to discuss publicly what was intended as a private update for members.

Another GOP aide familiar with the conversation said Trump told the members again and again that the party would pay a steep price in next year’s midterm elections if it failed to pass his plan.

The Senate last week passed a budget plan that includes rules that will allow Republicans to get tax legislation through the Senate without Democratic votes or fear of a Democratic filibuster. House Republicans signaled Friday they would simply accept the Senate plan to avoid any potential delay on the tax measure.

Republicans are desperate to rack up a legislative win after a series of embarrassing failures despite the party controlling both chambers of Congress and the White House. Topping the list: their stalled attempts to pass legislation repealing and replacing “Obamacare.” If tax overhaul legislation doesn’t pass, many in the party fear a complete rout in 2018.

On the conference call Sunday, House Speaker Paul Ryan told members he hoped to pass the Senate version of the budget bill this week to increase the chances that a tax overhaul can be enacted by year’s end.

President Donald Trump speaks during a joint statement with Singapore’s Prime Minister Lee Hsien Loong in the Rose Garden of the White House, Monday, Oct. 23, 2017, in Washington. (AP Photo/Evan Vucci)