Lawmakers are advancing the bill as fast as they can, with some major policy questions unanswered.

The Senate came closer on Wednesday to approving a bill that cuts taxes mostly for corporations and the wealthy.

The legislation, which also includes temporary tax breaks for middle-class households, cleared a procedural vote by a margin of 52 to 48. A vote on final passage could come as soon as Thursday.

Republicans had apparently not resolved several intraparty disagreements over the legislation, leaving key policy questions unanswered. They seem to be struggling most with the fact that the legislation would bring about a loss of revenue, and therefore add to the national debt.

Many Republicans have argued that, contrary to all evidence and expert analysis, the tax cuts would boost economic growth so much that the lost revenue would be recouped by increased receipts from surging business activity and personal spending. Those arguments are not carrying the day.

Several GOP senators emerged from a caucus lunch on Wednesday talking about the idea of including a debt “trigger” in the bill that would cut discretionary spending if the bill does not spur sufficient economic growth. Deficit hawks like Sens. Bob Corker (R-Tenn.) and James Lankford (R-Okla.) initially insisted on a similar measure that would roll back the bill’s corporate tax cuts if certain revenue targets aren’t hit in the future.

It remained unclear on Wednesday what the provision would ultimately look like.

“I do not like the idea of automatic tax increases,” Sen. John Kennedy (R-La.) said. “I would much prefer the idea of an automatic spending cut on the discretionary side. I would, frankly, think we don’t need either.”

Funnily enough, the Senate bill already includes substantial tax increases, because, in a bid to keep the legislation’s cost beneath $1.5 trillion over 10 years, most of the tax breaks for individuals would expire at the end of 2025. While those cuts would be temporary, the bill would permanently adjust the way tax brackets change with inflation. The brackets would rise more slowly than incomes, resulting in more income getting taxed at higher rates.

Sen. Mike Rounds (R-S.D.) said he didn’t think the trigger issue would need to be resolved before the Senate actually passes its bill. Instead, he suggested the Senate could pass the legislation, then resolve the trigger in the process of merging the House and Senate bills in what’s known as a conference committee.

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