Senate Majority Leader Harry Reid will release today his version of healthcare reform. This is the latest in a long line of Democratic healthcare overhaul measures that have dominated Congress this year. Three House committees and two Senate committees passed their healthcare proposals before the full House approved their measure earlier this month.

Reid’s long-awaited version is expected to receive a test vote as early as this week.  Reid is unveiling his proposal after waiting on cost estimates from the Congressional Budget Office. Previous healthcare bills came out before the cost estimates and where soon criticized for their high price tags. This time Senate Democrats have scheduled a 5 p.m. EST closed-door briefing on the bill where the CBO will also provide cost estimates.

Reid needs 60 voted in the Senate during a procedural vote to move forward with the bill. That leaves little wiggle room as Democrats hold exactly 60 seats in the Senate. Some Democrats oppose the government-run insurance option while others are concerned that the measure may allow for the federal funding of abortion.

If the Senate ultimately passes its bill, then lawmakers will have to work out the differences between the Senate version and the already-passed House version of healthcare.