Senate Republican leaders plan to go further with their ObamaCare repeal bill after finding that the House-passed version cannot win a simple majority on the floor.

“The House guys are going to be surprised when they learn they were outflanked by the Senate, which will pass a more conservative ObamaCare repeal,” said a Senate GOP aide.

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“We hear they want to significantly expand on the House bill.”

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) plans to move the repeal bill through a special process known as reconciliation, which cuts off any opportunity for a filibuster. The catch is that the process can only be used if the bill reduces the federal deficit.

Sens. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (Fla.) and Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (Texas), who are vying for the GOP presidential nomination, have forced McConnell’s hand by announcing they will not support the House bill. They say it does not go far enough to repeal President Obama’s healthcare law.

Senate Republican Whip John Cornyn John CornynThe Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Liberal super PAC launches ads targeting vulnerable GOP senators over SCOTUS fight Senate GOP faces pivotal moment on pick for Supreme Court MORE (Texas) said Monday the House bill could be strengthened on the Senate floor.

“Everybody will be able to offer amendments so we’ll have a vote-a-rama,” he said. “We’ll go as far as we can consistent with the Senate rules.”

The House-passed legislation leaves in place several of the law’s tax increases, which generate hundreds of billions of dollars for the government. It also preserves health insurance subsidies and an expansion of Medicaid.

The lower chamber’s bill repeals the “Cadillac tax” on expensive employer-provided plans, the medical device tax and the law’s requirements to buy and provide insurance plans.

“They’re exploring ways to go further than the House bill,” said another Senate GOP aide. “But they need to figure out how far they can go without losing people.”

The aide said while conservatives are pushing for a repeal of the Medicaid expansion, “that’s complicated for some Republicans.”

Aides say a vote on the repeal package may slide into December because leaders don’t yet have enough support.

“They’re whipping the votes and they haven’t scheduled it yet,” said the aide. “If we can’t get enough votes for a Senate amendment, we’ll vote on the House bill.”

Rubio’s position in the repeal fight could sway other Senate Republicans, who are coming around to the view that he is the party’s likely standard-bearer next fall.

Cruz, who has outperformed expectations by surpassing former Florida Gov. Jeb Bush in the polls of the presidential race, will try to make the vote a litmus test for his party’s leaders.

Conservative Sen. Mike Lee Michael (Mike) Shumway LeeMcConnell shores up GOP support for coronavirus package McConnell tries to unify GOP Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (R-Utah) signed on to the statement with Rubio and Cruz announcing their opposition to the House bill.

With Rubio, Cruz and Lee demanding a stronger bill, McConnell has little room for error. With a 54-memebr majority, Republicans can only afford three defections and still have a repeal bill pass on the floor.

Sen. Rand Paul Randal (Rand) Howard PaulSecond GOP senator to quarantine after exposure to coronavirus GOP senator to quarantine after coronavirus exposure The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill MORE (R-Ky.), who is also running for president, has said he won’t rest until ObamaCare is “100 percent repealed.”

“I’m for repealing the whole thing,” he told Politico last month.

A full repeal could cause heartburn for Republicans facing tough reelection races in swing states, where certain parts of the law, such as letting young adults stay on a parent’s health plans until age 26, are popular.

“Voting to take away health insurance for individuals with pre-existing conditions, to deny women preventive care, and to jack up the prices on prescription drugs for seniors would be an albatross around the neck of Republicans running in 2016,” said a Senate Democratic leadership aide.

The final reconciliation package is unlikely to include language defunding Planned Parenthood, which Senate sources say runs afoul of the Byrd Rule. That test, which was established by the 1974 Budget Act, determines what provisions can pass with simple majorities under reconciliation.

Senate aides predict the Planned Parenthood provision would fail a primary test of Byrd Rule, which stipulates that all elements of a reconciliation package must be directed at affecting government outlays and revenues.

The main purpose of defunding Planned Parenthood is to strip the family planning group of government resources, not to affect the budget baseline, according to sources familiar with Senate procedure.

Excluding Planned Parenthood from the bill could help McConnell win over moderate Sens. Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (R-Alaska), Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-Maine) and Mark Kirk Mark Steven KirkLiberal veterans group urges Biden to name Duckworth VP On the Trail: Senate GOP hopefuls tie themselves to Trump Biden campaign releases video to explain 'what really happened in Ukraine' MORE (R-Ill.), who have raised opposition to defunding the group.

Senate GOP leadership aides, however, caution that the bill is still under discussion and won’t be settled until the parliamentarian, Elizabeth MacDonough, has a chance to rule on it.

Cornyn said “there’s been ongoing discussions” about the Planned Parenthood language, adding “I’m not aware of any conclusion that’s been reached on that.”

“We don’t know what the parliamentarian will allow, so we won’t jump to any conclusions on what our bill will be,” said a Senate GOP aide.

The parliamentarian has already signaled she will take a strict approach to determining what parts of ObamaCare can be targeted.

She signaled to House GOP leaders earlier this fall that a provision to scrap the Independent Payment Advisory Board, which was established to cut Medicare costs above a certain threshold, would not pass muster.

House leaders then cut it from their version of the package.

Some Senate conservatives are pushing for a bill that would repeal all of ObamaCare in a single sentence.

But MacDonough signaled earlier this year that such a maneuver would not fly.

Proponents of this blanket strategy argue, however, that she has only provided preliminary indication and has not yet heard full arguments from both proponents and opponents of the tactic.

Some Senate aides also question whether repeal of the individual and employer mandates, central components of the House bill, can pass the Byrd Rule.

The mandates are designed to pressure people into obtaining and providing health insurance coverage, and they do not have a direct and significant impact on the budget.