Conservative advocacy groups that provide much of the political muscle for Tea Party-friendly lawmakers and candidates are coming out against the Senate healthcare reform bill, panning it as a disappointment.

These critics on the right say the legislation falls well short of the Republican promise to repeal ObamaCare despite Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellDemocratic senator to party: 'A little message discipline wouldn't kill us' House to vote on resolution affirming peaceful transition of power Republican lawyers brush off Trump's election comments MORE’s (R-Ky.) argument that it will fix an “unsustainable” status quo.

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“We’re saying it would be better named the ObamaCare Forever Act. We’re not happy with the bill as it is,” said Jon Meadows, a spokesman for FreedomWorks, a prominent conservative advocacy group.

Conservative groups say the legislation will do little to bring down premiums, bolstering senators such as Ted Cruz Rafael (Ted) Edward CruzCrenshaw looms large as Democrats look to flip Texas House seat SCOTUS confirmation in the last month of a close election? Ugly The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE (R-Texas), Mike Lee Michael (Mike) Shumway LeeBipartisan representatives demand answers on expired surveillance programs McConnell shores up GOP support for coronavirus package McConnell tries to unify GOP MORE (R-Utah), Ron Johnson Ronald (Ron) Harold JohnsonThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' The Hill's 12:30 Report: Ginsburg lies in repose CHC leaders urge Senate to oppose Chad Wolf nomination MORE (R-Wis.) and Rand Paul Randal (Rand) Howard PaulRon Paul hospitalized in Texas The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Rand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case MORE (R-Ky.), who are holding out against the bill.

FreedomWorks President Adam Brandon said in a statement last week that the legislation “breaks” the promise McConnell made to conservatives to repeal the law “root and branch.”

Another conservative group, the Senate Conservatives Fund, on Monday said the Senate bill would “lead to higher premiums” and “hurt American families.”

“Mitch McConnell is leading his party into a box canyon that they will never escape. We hope Senate Republicans realize the mistake they are about to make and demand a bill that truly repeals ObamaCare and will reduce premiums,” said a spokesperson for the Senate Conservatives Fund.

The Club for Growth was still studying the bill as of Monday afternoon, but a conservative strategist predicted the group would come out against it.

The opposition from the right is not unanimous. Heritage Action, one prominent group, favors passage, while Americans for Prosperity wants lawmakers to make improvements.

Americans for Prosperity, which is backed by GOP mega-donors Charles and David Koch, did, however, call the Republican healthcare legislation a disappointment because it did not come close to full repeal.

It has stopped short, however, of calling for defeat of the bill, giving McConnell a glimmer of hope that he may be able to reverse GOP “no” votes.

“We’re disappointed lawmakers haven’t done more to improve healthcare, but we are committed to working with them to make progress,” said Brent Gardner, the chief government affairs officer for Americans for Prosperity.

GOP senators have to take the positions of the conservative groups into account because they could fund primary challengers against them in future elections.

But McConnell is making the argument to his members that failing to repeal ObamaCare would be the real election gamble, given that they have promised to roll back the law for the past seven years.

Senate GOP leaders plan to have a procedural vote Tuesday or Wednesday to begin debate on the legislation, though at this point it’s uncertain whether they have enough support to clear even that routine hurdle.

It’s unclear whether the changes to the bill that Cruz and other conservatives are pushing for — such as allowing companies to sell health plans that are exempt from government standards or sell insurance policies across state lines — can pass muster with GOP moderates or the Senate parliamentarian.

At the same time, Republicans are coming under heavy pressure from leaders to help President Trump score his first major legislative win.

“Some feel like it’s a good deal because they’re going to get some Medicaid reforms and it’s the only way to change ObamaCare without leaving it in place, but many other conservatives like myself believe this is a terrible deal and it will ensure that ObamaCare will never ever be repealed,” said Brian Darling, a former senior aide to Paul.

Senate negotiators revised the legislation Monday to address complaints about high premiums by adding language that would penalize people who let their coverage lapse for 63 days or longer by requiring them to wait six months before buying insurance.

The motivation is to keep healthier people in the insurance marketplace and put downward pressure on premiums. As the proportion of sick people in the market increases, so do costs for the insured.

GOP leaders claimed a measure of victory Monday evening when the Congressional Budget Office in an analysis predicted that federal cost-sharing subsidies would lower premiums by reducing the cost of insuring people with high healthcare costs.

“Our plan will help address ObamaCare’s ballooning costs for consumers by lowering premiums over time and cutting taxes, and today’s estimate confirms that,” said Senate Republican Whip John Cornyn John CornynHillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Lawmakers introduce legislation to boost cybersecurity of local governments, small businesses On The Trail: Making sense of this week's polling tsunami MORE (Texas).

Some prominent conservatives have come out in favor of the bill, even if their endorsements are somewhat cautious.

“I think that politically and from a policy standpoint the world is a better place if this bill passes than if it doesn’t,” Michael Needham, the CEO of Heritage Action for America, said on “Fox News Sunday.”