Senate Majority Whip John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (R-Texas) said on Sunday that tax-reform legislation poised to pass through both houses of Congress this week could have been better if Democrats had participated in drafting the plan.

"Our Democratic colleagues simply refused to participate in the process. We probably could have made it better if they had, but we were determined to get this job done, to cut taxes, to reform the tax code for the first time in 30 years," Cornyn said on ABC News's "This Week."

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Cornyn was responding to recent criticism of a last-minute tax break that could give millions of dollars to 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 and others who receive money from the real estate sector through limited liability companies (LLCs).

"Picking out one piece in a thousand-page bill and saying 'this is going to benefit somebody,' I just think that takes the whole bill out of context," Cornyn said.

The senator's comments come as House and Senate Republicans find themselves on the brink of their first major legislative victory of Trump's presidency in the form of a tax code overhaul.

Trump has said he wants to sign a final version of the bill by Christmas.

Cornyn said he expects the bill will pass the Senate on Tuesday.