The chairman of the largest bloc of House conservatives is criticizing a bipartisan deal in the Senate that would extend critical payments for ObamaCare to insurers, arguing it will help prop up a law the GOP vowed to dismantle.

Republican Study Committee (RSC) Chairman Mark Walker (R-N.C.) also argued “ObamaCare is in a 'death spiral.' "

"Anything propping it up is only saving what Republicans promised to dismantle,” he tweeted.

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The proposal worked out by Sens. Lamar Alexander Andrew (Lamar) Lamar AlexanderToobin: McConnell engaging in 'greatest act of hypocrisy in American political history' with Ginsburg replacement vote Chamber of Commerce endorses McSally for reelection Trump health officials grilled over reports of politics in COVID-19 response MORE (R-Tenn.) and Patty Murray Patricia (Patty) Lynn MurrayTrump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Wash.) would extend payments compensating insurers for lowering the out-of-pockets costs of certain Obamacare enrollees for two years.

Trump announced last week he was ending those payments, arguing the Obama administration never had the power to make them.

Supporters of ObamaCare argue that premiums will rise and enrollment will likely fall without the payments, and have pressed Congress to take action.

But the opposition from Walker is significant, and suggests Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.) could run into stringent opposition from his own party if he seeks to advance the legislation in the House. The RSC has more than 150 members.

The deal would also grant states more flexibility to waive ObamaCare rules and restore $106 million in outreach funding for ObamaCare, according to a Democratic aide.

Trump appeared to signal his support for the deal, saying it’s “a short-term solution so that we don’t have this very dangerous little period” for insurance companies.