Republicans on the House tax-writing panel will kick off that process Sunday, when they return to Washington for a two-day huddle on the nuts and bolts of reform.

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Major friction points remain.

Prime among them is a new levy on imports that House GOP leaders favor as a way to raise roughly $1 trillion to help pay for rate reductions.

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The idea is supported by House Speaker Paul D. Ryan (R-Wis.), a former chairman of the tax-writing panel who has his own plan for overhauling the tax code that lowers rates less than Trump wants and streamlines the code overall.

Treasury Secretary Steven Mnuchin and White House National Economic Council Director Gary Cohn don’t support the border adjustment tax and left it out of the White House outline. But Mnuchin offered a tempered critique of the proposal Wednesday, saying the administration doesn’t support the tax “in its current form,” and Brady said its boosters are open to making major changes.

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Other Republicans in Congress have signaled their opposition. A number in the Senate, including those representing oil refiners and retailers who say it will cause their costs to spike, call it a nonstarter.

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Rep. Jim Jordan (R-Ohio), a leading member of the hard-line House Freedom Caucus, said he thinks most members of that group will align against it, too. “So Republicans get in power and the first thing we’re going to do is put a new tax on the American people?” he said. “You’ve got to be kidding me.”

Defenders say a border adjustment tax would help Trump make good on his campaign pledge to encourage U.S. companies to keep jobs and operations here and penalize those that don’t. And they point to economic projections indicating the policy would strengthen the dollar, making it cheaper to buy imports and canceling the burden on consumers from higher taxes on those goods.

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Longtime tax lobbyist Ken Kies said they should make the call as soon as possible. “If I were advising them, I’d say, ‘You better figure it out soon, because the longer you drag this out, the harder it’s going to be to get a tax bill done this year,’ ” he said.

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In some key areas, the latest Trump plan actually moved closer to the tax blueprint that Ryan and Brady unveiled last summer.

Rather than eliminating corporations’ ability to defer paying taxes on profits earned abroad, as Trump proposed during the campaign, the administration echoes the House GOP’s call to move to a territorial tax system, under which companies would face no U.S. tax at all on their foreign profits.

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And on the individual side of the code, the new Trump plan now mirrors the House GOP’s proposal to roughly double the standard deduction that filers can claim to reduce their taxable income.

The new Trump proposal amounts to a thumbnail sketch — less than 200 words on a single page. That vagueness may give White House negotiators more room to seek common ground with congressional Republicans.

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It also leaves some fundamental questions hanging: Will tax cuts expire after a few years or remain embedded in the code? Will the plan pay for itself, and if not, how much will it cost? Will it just slash rates or seek a more wholesale reinvention of the tax system?