On Friday, US Senate Republicans will wrestle with the possibility of adding a tax increase to sweeping legislation meant to reduce taxes on businesses and individuals, in an attempt to win support from fiscal conservatives concerned over the bill's impact on the federal deficit. As a mandatory twenty hours of debate nears its end, Republican lawmakers could move to a final vote later in the day following a potentially chaotic "vote-a-rama" on amendments offered by both Republicans and Democrats. Despite roadblocks, many Republicans remain optimistic that the bill could be approved this week.