Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) sent a letter on Sunday to Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah) asking how a provision that would potentially benefit real estate owners, including Corker, made it into the final version of the Republican tax-reform bill.

“Because this issue has raised concerns, I would ask that you provide an explanation of the evolution of this provision and how it made it into the final conference report,” Corker wrote.

The International Business Times reported Saturday that a provision added during the reconciliation process allows owners of income-producing real estate to take advantage of a 20 percent deduction for "pass-through" entities. The Senate version of the tax bill included rules that allowed the deduction to be claimed only by businesses that pay their employees significant wages.

The provision would potentially benefit Corker and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE, among others.

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Corker said Sunday he did not have a role in writing the legislation and asked Hatch, the chairman of the Senate Finance Committee, to explain how the provision made it into the final bill. He suggested it was in the House’s version of the tax bill and remained in the final version after a conference committee sought to reconcile the House and Senate tax bills.

Corker announced late last week he would support the final Republican tax-reform legislation, saying he believes the country is better off with it than without it.

He voted against the Senate version of the tax bill, citing concerns that it would add to the national debt.