"I think it's more likely it will be the week after Thanksgiving," said Cornyn, the No. 2 Senate Republican, asked about when the Senate could take up its tax plan.

He pointed to "the challenges over here dealing through what budget reconciliation, the Byrd bath and things like that [require]" as the reason for the likely delay.

The Byrd rule and reconciliation both govern the Senate's consideration of the tax bill because Republicans are trying to pass it with a simple majority, which could allow them to avoid a Democratic filibuster.

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Thursday's comments are a shift from the Senate GOP majority whip's previous predictions. He said as recently as Monday that the Senate would pass its legislation before they left town for Thanksgiving.

"Yes, we need to get the tax bill out of the Senate before Thanksgiving," Cornyn added when asked if he thought lawmakers would work during the weeklong break.

And the Senate passing its own bill before the break could have allowed lawmakers to work on merging the proposals over the week-long recess.

But the timeframe left senators with a narrow window to get their legislation through the upper chamber. The Senate Finance Committee is expected to start its consideration of the tax plan on Monday.

And the Senate is scheduled to leave town on Friday, Nov. 17 — meaning they would either need to stay in town longer to get it passed before the holiday or try to move their bill at breakneck speed.

Senators are expected to return to Washington on Nov. 27, which could allow them to hold a final vote by the end of the week. But it also pushes debate over the tax plan closer to the Dec. 8 government funding deadline.

Republicans want to get a tax plan to President Trump's desk by the end of the year.