A majority of small businesses in a new survey opposes the GOP tax plan.

A Public Policy Polling poll, released by Businesses for Responsible Tax Reform, a group opposed to the GOP tax bills, finds 51 percent of small businesses are against the plan. About one-third, 34 percent, support the GOP tax plan.

Slightly more than 50 percent of the small business owners surveyed think the GOP tax plan supports large corporations over small businesses.

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A majority of small business owners also said the plan will benefit wealthy corporations the most.

The survey was conducted from Nov. 17 to 18 by the Democratic firm. It included responses from 794 small business owners.

Senate Republicans are rushing to pass their tax plan this week, after it was voted out of the Senate Finance Committee along party lines.

Republicans can lose only two GOP senators, if every Democrat votes no, if they want to get the legislation passed. Sen. Ron Johnson Ronald (Ron) Harold JohnsonThis week: Supreme Court fight over Ginsburg's seat upends Congress's agenda GOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate MORE (R-Wis.) has announced his opposition to the plan.

Several GOP senators have raised concerns about the impact the tax plan could have on the deficit.

If the Senate passes its plan this week, Republicans will still need to work out a deal in conference committee to reconcile the differences between the Senate version and the House bill passed before Thanksgiving, and pass that final conference legislation.