Tax Bill Thrown Into Uncertainty as First G.O.P. Senator Comes Out Against It

"These businesses truly are the engines of innovation and job creation throughout our economy, and they should not be left behind," he said in a statement. "Unfortunately, neither the House nor Senate bill provide fair treatment, so I do not support either in their current versions."

Senators Susan Collins of Maine, Bob Corker of Tennessee and John McCain of Arizona have voiced their own concerns and refused to say whether they would ultimately vote for the tax bill.

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"I want to see the whole package before I make a decision," Mr. McCain said.