Republican leaders and the White House are trying to learn from the rocky start of healthcare reform as they pursue an overhaul of the tax code.

The House’s bill to repeal and replace ObamaCare suffered a near-death in March, when factions of the Republican conference warred openly over the details of the legislation. While the bill was revived earlier this month, GOP leaders want to prevent something similar from happening on tax reform.

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To that end, they have been cautious about setting hard deadlines for tax reform legislation, even as they spend time gathering feedback at hearings and outreach sessions.

Republican leaders intend to pass both healthcare and tax legislation without Democratic votes, which leaves little margin for error. The party can’t afford another major eruption over tax reform similar to the fight that nearly took down the healthcare bill.

The White House, House and Senate are trying to get on the same page before the tax legislation is even released.

With tax reform, there’s an acknowledgement that “it would be better to have unanimity upfront,” said Rohit Kumar, a former aide to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMcConnell focuses on confirming judicial nominees with COVID-19 talks stalled McConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt MORE (R-Ky.) who now leads the tax-policy practice at PricewaterhouseCoopers.

House Republican leaders are facing resistance among the rank and file to several aspects of their tax reform plan, including a new tax on imports known as border adjustment and the elimination of the deduction for businesses’ net interest expenses.

As a result, House GOP leaders have realized that they will have to take their time with the legislation, said Howard Gleckman, a senior fellow at the Urban-Brookings Tax Policy Center.

“There’s a real change of the approach in the House,” he said.

The House Ways and Means Committee started holding tax reform hearings on Thursday, when several business leaders testified about why they want the tax code to be changed.

The panel plans to hold more hearings in the weeks to come, including a session Tuesday on the border-adjustment proposal. Additionally, Treasury Secretary Steven Mnuchin is slated to testify before the House Ways and Means Committee and the Senate Finance Committee this week, following the release of President Trump’s budget request.

Ways and Means Committee Chairman Kevin Brady Kevin Patrick BradyBusinesses, states pass on Trump payroll tax deferral Trump order on drug prices faces long road to finish line On The Money: US deficit hits trillion amid pandemic | McConnell: Chance for relief deal 'doesn't look that good' | House employees won't have payroll taxes deferred MORE (R-Texas) told reporters last week that the panel didn’t hold hearings on the ObamaCare repeal bill because they felt like they needed to act quickly on the legislation.

“We had, I think, in healthcare more urgency to do that early in the session because ObamaCare’s collapsing,” said Brady, whose panel has jurisdiction over both tax and healthcare issues.

“On tax reform, the urgency is for this year, which allows us in 2017 to sort of lay the groundwork,” he added.

Besides hearings, GOP leaders are engaging with lawmakers and industry groups in other ways. Both congressional leaders and administration officials have been meeting with rank-and-file lawmakers and business leaders in recent weeks.

Tim Phillips — president of Americans for Prosperity, a conservative advocacy group that opposed the initial version of the House GOP healthcare bill — said he sees a “marked positive difference” in congressional leaders’ approach since the first healthcare bill was introduced.

He said policymakers are having more discussions with stakeholders about their priorities and that Republicans are focusing more on the areas where they are in agreement. He also said that the administration and Congress are “clearly talking a lot more than during the initial healthcare discussion.”

“We’re optimistic about tax reform this year now, in part because the process is so much better,” Phillips said.

Some aspects of the tax legislation are still likely to be crafted behind closed doors, given the difficulty of the trade-offs involved and potential differences between the White House, House and Senate.

Tax reform is “still going to be really hard to do,” said Gleckman, of the Tax Policy Center.

But Phillips said that he thinks GOP lawmakers and conservative groups have not been as heated about criticizing leadership on taxes as they were on healthcare.

GOP lawmakers know that the expectations for tax reform are high, which “does seem to be tempering the desire to grandstand,” he said.

Some of Republicans’ outreach efforts have involved Democrats. Members of Trump’s economic team met with both Republican and Democratic members of the Senate Finance Committee last week, and Democratic lawmakers are getting the chance to ask questions at hearings.

Democrats are happy that the hearings are being held on tax reform and hope that there will be even more of them in the future. During Thursday’s hearing, Rep. John Larson (D-Conn.) said to the business leaders testifying, “We believe on this side strongly that we need to return to regular order and that we need to have witnesses like you and an open process throughout where both sides actually participate in the drafting.”

But liberals are also concerned that their opinions really won’t carry much weight.

As is the case with healthcare, congressional GOP leaders say they want to pass tax legislation through a process known as reconciliation so that Democratic votes are not needed. Additionally, Democrats are criticizing both Republicans’ healthcare and tax proposals as focused too much on tax cuts for the wealthy.

“The bottom line is the agenda is substantively the same, and so holding a hearing or two is not going to make the process that much different,” said Seth Hanlon, a senior fellow at the Center for American Progress who worked on the White House National Economic Council during former President Barack Obama Barack Hussein ObamaThe Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon Trump appointees stymie recommendations to boost minority voting: report Obama's first presidential memoir, 'A Promised Land,' set for November release MORE’s tenure.