Mr Daines, of Montana, and Mr Johnson, of Wisconsin, were among the few remaining Republicans who were on the fence.
But they signalled their support for the legislation, which includes steeps corporate tax cuts, in statements on Friday.
“After weeks of fighting for Main Street businesses including Montana’s farmers and ranchers, I’ve decided to support the Senate tax cut bill which provides significant tax relief for Main Street businesses,” Mr Daines said in a statement.
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