Initially, 11 Republicans signed off on an outline of the plan, which proposed to pump nearly $600 billion in new spending for "hard" infrastructure and cost a total of $1.2 trillion over the next eight years. Getting the bill through the Senate would require at least 10 Republicans to back the measure -- assuming all 50 members of the Democratic caucus stay united, which is also highly uncertain. But five of those 11 GOP senators told CNN on Monday that they are not committed to backing the bill, wary of some of the details for paying for the measure that have come to light and expressing misgivings about Democratic leaders' plans to move the narrower bipartisan bill alongside a much-larger Democratic-only bill that would fulfill much of President Joe Biden's economic agenda... Of the 11 Republican senators who announced they were supporting a bipartisan infrastructure framework in June, a number say they have serious concerns about whether their proposal could be held hostage until Democrats complete their own party-line bill that will include massive social policy revisions on child care and sick leave and an extension of the boosted child tax credit. That bill is expected to make sweeping changes to the tax code on the personal and business side and raise the corporate tax rate. Republicans have said tying the two proposals together was not part of the agreement and that the added comments from Democrats like Pelosi in the House and even the President have not been helpful to try to sell the proposal to their GOP colleagues.