GOP leaders said Wednesday that they'd issue a more detailed framework of their tax overhaul the week of September 25. But while lawmakers are eager to get more details about the outline being hashed out by the so-called Big Six team of negotiators, Republicans are still divided on key elements of the plan — going from blueprint to bill is bound to be a contentious process. 

In his opening remarks at a Senate Finance Committee hearing today on individual tax reform, Sen. Orrin Hatch (R-UT) said the plan from the Big Six — of which he is one — "will not dictate the direction" the tax-writing committee takes. "Anyone with any experience with the Senate Finance Committee knows that we are not anyone’s rubber stamp," he said. "If a bill – particularly on something as consequential as tax reform – is going to pass in this committee, the members of the committee will have to be involved in putting it together."

Oh, and remember: Republicans also need to agree on a budget before they can push through tax reform without Democratic votes.