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Input: Sen. Ron Johnson (R-Wis.) is surrounded by reporters as he goes to vote on Capitol Hill in Washington. (Susan Walsh/AP)
The lawmakers attracting the most concern from leadership and the White House are Sen. Ron Johnson (R-Wis.) and Steve Daines (R-Mont.)  who say the current version of the bill favors corporations over other businesses.
It’s unclear if  Johnson  would accept these changes as sufficient  and a final decision hasn’t been made. If Republican leaders believe  Johnson ’s demands have become too unreasonable  they could try and forge ahead without  his  vote.
Spokesmen for  Johnson  and Daines didn’t have an immediate comment on the discussions.
At least six GOP members have raised concerns about specific provisions in the GOP tax bill  though none has flatly said they plan to vote against it this week.  Johnson  came closest  saying  he  opposed the measure but later suggesting  he  could support it with changes.
Voting on the tax measure is scheduled to begin Tuesday  as the Senate Budget Committee plans to take a procedural step that afternoon that would effectively send the tax bill to the Senate floor. But  Johnson  is on the budget panel  and  he  could demand changes by Tuesday in order to win  his  vote. If  he  blocks the tax bill in the Budget Committee and is joined by Sen. Bob Corker (R-Tenn.)  who has raised separate concerns  the package could quickly die.

Senate GOP tax plan could get late changes to win over holdouts