WASHINGTON (AP) — Senate Republicans revealed the details of their sweeping tax legislation Thursday, including a one-year delay in plans for a major corporate tax cut despite strident opposition from the White House and others in their own party. Their bill would leave the prized mortgage interest deduction untouched for homeowners in a concession to the powerful real estate lobby but would ignore a House compromise on the hot-button issue of state and local tax deductions.

On the other side of the Capitol, the House Ways and Means Committee approved its own version of the legislation on a party-line 24-16 vote, amid intense political pressure on the GOP to push forward on the first major rewrite of the U.S. tax code in three decades. It’s President Donald Trump’s top priority and a goal many Republicans believe has grown even more urgent in the wake of election losses on Tuesday that displayed an energized Democratic electorate.

Yet as the Senate Finance Committee unveiled its bill, a few stark differences emerged with the version approved by the House tax-writing committee, underscoring the challenges ahead in getting both chambers to agree on the complex and far-reaching legislation that would affect nearly every American.

The Senate measure fails to repeal the estate tax, though it doubles the size of estates exempted from the tax. It makes couples earning up to $1 million eligible for a $1,650 per-child tax credit. It creates a new 38.5 percent tax bracket for couples earning more than $1 million and individuals making more than $500,000 per year. And it takes a different approach to cutting taxes for businesses not organized as corporations that is less generous but applies to more businesses.

Democrats are strongly opposed to the GOP rewrite, so the Republicans must find agreement among themselves to have any hope of passage.

The Senate bill would fully repeal the state and local deduction claimed by many taxpayers, an idea that has drawn vigorous opposition from House Republicans in New York and New Jersey and resulted in a compromise in the House version of the bill that would allow property taxes to be deducted up to $10,000.

House Majority Leader Kevin McCarthy told The Associated Press that the Senate’s total-repeal approach would face tough sledding in his chamber. As for the hard-fought compromise, he said, “I think it’d be difficult not to have it in the final bill.”

On the other hand, the House bill would lower the cap on the mortgage interest deduction, an idea that caused intense blowback from the real estate lobby, but the Senate tax measure would leave it unchanged. That means homebuyers would continue to be able to deduct interest payments on loans of up to $1 million as permitted under current law; the House bill would reduce the limit to $500,000 for new home purchases.

The feverish efforts by Republicans in both chambers are aimed at fulfilling a self-imposed deadline to get legislation out of the House and Senate before Thanksgiving so the period between then and Christmas can be devoted to reconciling the two versions.