Senate Republicans were confident they had the support needed to pass their tax overhaul Friday as last-minute changes brought more GOP lawmakers on board.

"We have the votes," Senate Majority Leader Mitch McConnell told reporters after GOP senators emerged from a meeting.

By passing the bill, the Republican Party would step closer to its goal of overhauling the American tax code under a unified government. As McConnell spoke, the GOP still had not released the final text of the bill it wants to push through later Friday.

Sens. Steve Daines, R-Mont., and Ron Johnson, R-Wis., earlier Friday said they would back the bill after securing further tax relief for pass-through businesses. Then, holdout Sens. James Lankford, R-Okla., Jeff Flake, R-Ariz., and Susan Collins, R-Maine, committed to supporting the plan, leaving Republican leaders confident that they had the support.

Sen. Bob Corker, R-Tenn., will oppose the plan over deficit concerns, the only Republican to say he would vote against it as of Friday evening.

"While I support a number of the provisions included in this legislation and continue to believe it would have been fairly easy to alter the bill in a way that would have been more fiscally sound without harming the pro-growth policies, unfortunately, it is clear that the caucus is in a different place," Corker said in a statement.

The support Friday from the other senators, among the last Senate GOP holdouts, all but guarantees that Senate Republicans can pass their plan. The GOP scrambled to rework the bill after a last-minute setback Thursday night.