US Republican Senator Johnson will vote against tax bill if his concerns are not resolved

Coming down to the wire as some Senators still are not committed

As the vote for the Senate tax reform gets nearer (could be Wednesday), US Rep Senator Ron Johnson says he will vote against the tax bill if his concerns are not resolved. Sen Johnson wants small business tax breaks to be expanded.

The vote requires 51 votes to pass. There are 52 Republican Senators. All Democrats are expected to vote "No".