The window is quickly closing if Senate Republicans want to vote on a health care bill before the July 4 recess.
But if the GOP leaders are on the cusp of a vote, most senators aren't in the loop. Republican leaders continue to be under fire -- even from their own members -- for their tightly guarded process to repealing Obamacare.
It's being kept under wraps by design. Majority Leader Mitch McConnell needs to be as close to 50 votes as possible before he unveils his legislation. Reveal it too soon and criticism from outside conservative groups, independent reviews and Democrats could have the bill unravel before it hits the floor.
That means the critical lawmakers are also holding back.
"Until I see the bill and the (Congressional Budget Office) assessment of the bill, I'm not going to feel comfortable taking a position," said Sen. Susan Collins, a Republican from Maine.
Democrats are also weighing their options this week on how to slow the GOP's health care efforts. Sen. Bernie Sanders said he is "in favor" of Democrats using parliamentary tactics that could essentially bring the Senate to a halt.
"I am in favor," Sanders told CNN's Jake Tapper on "State of the Union" Sunday. "I am in favor of the American people and members of Congress doing everything that we can to defeat that horrific piece of legislation that will hurt tens and tens of millions of people in our country."
One Senate aide says Democrats' current plan is to hold the floor until midnight and members will use the time to tell constituent stories about the Affordable Care Act.
Another twist: Tuesday's special congressional election in Georgia. A win for Democrat Jon Ossoff could be seen as a stark warning to President Donald Trump and the GOP Obamacare repeal efforts.
Against that background, McConnell's task this week is two-fold: finish a bill and convince enough people to back it.
Here are the players who will decide the fate of health care in the Senate this week.
Ohio Republican Sen. Rob Portman
While the GOP has railed against Obamacare for years, there's one pillar of the health care law that plenty of Republican lawmakers now say is pivotal for their constituents: Medicaid expansion.
The House health care bill proposes gutting the program, effectively ending enhanced federal funding for Medicaid in 2020.
But Senate Republicans who hail from states that expanded Medicaid under Obamacare say that would cut off vital resources for some of their most vulnerable constituents much too abruptly.
Portman, a member of the Senate working group on the bill, has led the effort to convince leadership to accept a seven-year "glide path" -- a longer transition period in which Medicaid expansion state governors can figure out an alternative to the program. It's unclear what concessions leadership will ultimately make on the Medicaid front.
One sticking point in these deliberations is what will happen to patients who receive opioid treatment under expanded Medicaid. Senators like Portman are calling for more resources to be provided to governors so that opioid treatment funding doesn't end up on the chopping block.
Nevada Republican Sen. Dean Heller
Up for re-election in 2018 in a state Hillary Clinton won, Heller is perhaps one of the most vulnerable Republicans in this health care debate. Heller also comes from a state that thanks to expanded Medicaid has seen its uninsured rate drop from 23 percent to 12 percent.
The senator has been fighting alongside Portman to more slowly phase out federal money for Medicaid expansion. But Heller is facing a bit more pressure from back home. His Republican Gov. Brian Sandoval told the Nevada Independent
this week he would prefer the expansion didn't go away at all.
That's not going to happen in the Senate where non-expansion Republicans have argued that Medicaid-expansion states shouldn't be allowed to keep more federal money.
Texas Republican Sen. Ted Cruz
Cruz is trying a new role in the debate over health care: negotiator.
Rather than sticking to the firebrand, leadership-agitating strategy that defined his early years in the Senate, Cruz -- and those who have been working with him-- insist he is working constructively behind the scenes to get to 'yes' on health care.
But that doesn't change the fact that Cruz is still one of the Senate's most conservative members who has said that he wants to ensure that the Senate health care bill actually lowers premiums.
Like many conservatives, Cruz believes that in order to bring down the cost of health insurance, lawmakers need to repeal as many of the Obamacare-era regulations as possible. He also has advocated to repeal Obamacare taxes as soon as possible.
A twist: Cruz is up for re-election in 2018. And a bad position for Cruz would be to on the opposite side of Trump who has said he likes the direction the Senate bill is moving.
Alaska Republican Sen. Lisa Murkowski
Murkowski has been frank about her frustration with how the Senate is crafting their health care bill. She was invited to the White House to meet with the President last week on health care, but told reporters after the meeting that she had no idea if she was having an impact in the process because "I have no idea if we even have a bill."
"I mean I learn more from you all," she said to reporters.
Murkowski is independent-minded and fiercely loyal to Alaska, which has some of the most expensive insurance premiums in the country. Murkowski has said she wants to make sure that the Senate bill's tax credits are more generous for those living in rural places like Alaska than the House bill's were. She also has been critical of defunding Planned Parenthood, an item that will likely be included if McConnell needs conservative support for his bill.
Murkowski's not an easy get, but if leadership is amendable to her wishes, it could give an indication that the bill is moving in a more moderate direction.
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