Senate Democrats have a message for their Republican colleagues: The chamber has plenty of hearing rooms, and the GOP should use them to hold hearings on its healthcare bill, which they say has been drafted in secret.

In a letter sent Monday to the relevant panel chairmen, key Senate Democrats listed off 31 rooms where a hearing can be held, writing that “if you schedule a hearing, we guarantee all Democratic members of the Senate HELP, Finance or Budget Committee will be in attendance at any time or place that you choose.”

The letter was signed by Health, Education, Labor and Pensions Committee ranking member Patty Murray Patricia (Patty) Lynn MurraySenate Democrats introduce legislation to probe politicization of pandemic response Trump health officials grilled over reports of politics in COVID-19 response CDC director pushes back on Caputo claim of 'resistance unit' at agency MORE (D-Wash.), Finance Committee ranking member Ron Wyden Ronald (Ron) Lee WydenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Ore.), Budget Committee ranking member Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) and Senate Minority Leader Chuck Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.).

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They contrasted the Senate Republicans closed-door process with what they see as a much more transparent one during the debate over the Affordable Care Act.

At the time, the Finance Committee held more than 50 hearings, meetings and roundtables on health reform. The Health, Education, Pensions and Labor Committee had over 47. When the bill was on the Senate floor, the chamber spent 25 straight days in session on health reform, the four Democratic senators wrote.

The letter comes during what is sure to be a tense week for the Senate GOP’s efforts to repeal and replace ObamaCare.

Leadership is still aiming to hold a vote by the July 4th recess, but members are yet to see a final product of the bill. And key questions — and divisions — still exist, such as over the length of a Medicaid phase-out and how many ObamaCare insurance regulations to waive.

Meanwhile, Senate Democrats are ratcheting up the pressure. They’re planning to hold a late-night talkathon Monday, where they’ll protest the GOP’s efforts to gut President Obama’s signature health law with plans to speak until at least midnight.