Bullard is the first Fed member to come out against setting a timetable for winding down asset purchases.

Others, including Williams, Lochart, Plosser and Fisher have argued in favor of a roadmap for tapering when the first cut in monthly purchases is announced. Add Lacker to that list, as he says the Fed should clearly telegraph the path of QE reduction.

The main debate on Dec 18 will be tapering but a decision to include a roadmap or a cap would have larger implications for the US dollar.

A third debate will be around changing Fed thresholds but the FOMC minutes showed scant support for moving them around because it will create communication confusion. Lacker also underlined that point in his comments, which continue to cross the wires.