Senate Minority Leader Harry Reid Harry Mason ReidThe Supreme Court vacancy — yet another congressional food fight Trump seeks to turn around campaign with Supreme Court fight On The Trail: Battle over Ginsburg replacement threatens to break Senate MORE (D-Nev.) is arguing that Republicans must give up their hopes of passing an ObamaCare repeal through the Senate.

In a memo released Thursday, Reid's office declared that the GOP’s efforts to roll back ObamaCare’s individual and employer mandates would violate Senate rules.

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The memo said the chamber’s parliamentarian made that clear but that 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 has claimed incorrectly that the bill can be tweaked before passage.

“The Parliamentarian has ruled that Obamacare cannot be repealed through reconciliation, period. The idea put forth by Senator McConnell’s office that a so-called ‘technical fix’ can save Obamacare repeal in reconciliation is simply false,” Reid’s office wrote in a memo.

GOP leaders have pledged to repeal as much of ObamaCare as they can through a process known as reconciliation, which prevents the minority party from filibustering the legislation.

Some GOP senators have eyed a bill that would repeal even more of ObamaCare than a version the House passed, something Reid insists is not possible despite the claims from McConnell's office.

The parliamentarian, who is charged with interpreting and enforcing chamber rules, identified troublesome pieces of the reconciliation bill this week — specifically its attempt to repeal the requirements to purchase and offer health insurance. But McConnell spokesman Don Stewart told the Morning Consult news service earlier this week that the GOP will offer a “substitute amendment” to correct the issues.

Senate Democrats have argued that any measures, including amendments, dealing with ObamaCare mandates should require a full 60 votes to pass.

Stewart disputed the account from Reid's office on Thursday, arguing that the parliamentarian gave the greenlight for the Senate to proceed with the ObamaCare repeal bill. That bill will include an amendment that "preserves the provisions of the House-passed bill, while ensuring that the underlying bill complies with rules that apply only in the Senate," he said in a statement.

The House-passed reconciliation bill would repeal the ObamaCare mandates as well as defund Planned Parenthood. But the party has come under pressure from outside groups, as well as a handful of senators led by 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 (R-Texas), to go further with the repeal efforts.

The memo said Republicans can only make “narrowly tailored changes” to ObamaCare under reconciliation, throwing cold water on some Senate Republicans’ plans.

“The Senate is not the House of Representatives. Based on the Parliamentarian's ruling, the Senate reconciliation bill will have to be more supportive of Obamacare's mandates than the House-passed bill. There is no way around this simple fact,” the memo reads.

That bill is slated to receive a vote next week, likely with successive votes on amendments.

- Updated at 8:04 a.m.