The AARP is urging House and Senate leaders to waive congressional rules so the Republican tax bill doesn't trigger deep cuts to Medicare.

If Republicans pass their tax bill, which would add an estimated $1 trillion to the federal deficit, congressional “pay-as-you-go” rules would require an immediate $150 billion in mandatory spending cuts to offset the impact.

"The sudden cut to Medicare provider funding in 2018 would have an immediate and lasting impact, including fewer providers participating in Medicare and reduced access to care for Medicare beneficiaries,” AARP said in a letter sent to congressional leaders Thursday.

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Under the bill, according to the Congressional Budget Office, Medicare would be faced with a $25 billion cut in fiscal 2018.

But 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.) and 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.) have promised the cuts won’t happen.

In a joint statement sent just ahead of the Senate vote on the tax bill last week, Ryan and McConnell said there is “no reason to believe that Congress would not act again to prevent a sequester, and we will work to ensure these spending cuts are prevented.”

Lawmakers have voted numerous times in the past to waive the rule, and even House conservatives have said they’ll likely support a waiver once the tax bill passes.

"I can't imagine any scenario where there's not a waiver for PAYGO," House Freedom Caucus Chairman Mark Meadows Mark Randall MeadowsHouse moves toward spending vote after bipartisan talks House Democrats mull delay on spending bill vote Southwest Airlines, unions call for six-month extension of government aid MORE (R-N.C.) said Wednesday. "It's using a hammer when maybe a scalpel would do."

But in the Senate at least, Republicans will need the support of Democrats to waive the rules. So far, they have been reluctant to offer it.