WATCH: Senate Debates Tax Bill
The Senate is debating its tax overhaul bill. To pass it, the Republicans need strong party unity and leaders have been working on changes to firm up support among uncommitted lawmakers, as the GOP can only afford two no votes from its party and still pass the legislation. But even if the Senate does pass the bill by the end of the week, it will have to reconcile its version with the House's. Watch the debate unfold.