A group of Senate Democrats are demanding that a prominent GOP judicial group disclose its donors, citing their heavy spending in the confirmation fights over Supreme Court Justices Neil Gorsuch Neil GorsuchAbortion stirs GOP tensions in Supreme Court fight Poll: 59 percent think president elected in November should name next Supreme Court justice The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week MORE and Brett Kavanaugh Brett Michael KavanaughTrump faces tricky choice on Supreme Court pick The Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' MORE.

More than a dozen Democratic senators, including Senate Minority Leader Charles Schumer (N.Y.), sent a letter to Carrie Severino, the chief counsel and policy director of Judicial Crisis Network (JCN), asking for a list of the group's donors.

"Over the last week, the Judicial Crisis Network began a $1.1 million ad campaign calling for greater transparency by progressive advocacy organizations in the judicial nominations process. Yet, despite your organization’s claimed commitment to transparency, JCN continues to conceal the identity of its donors," the senators wrote in their letter.

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The group spent heavily during the confirmation fights for Gorsuch and Kavanaugh, and worked to oppose Merrick Garland Merrick Brian GarlandOn 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 Senate to push funding bill vote up against shutdown deadline Poll: Trump opens up 6-point lead over Biden in Iowa MORE's nomination to the high court during the final year of the Obama administration.

The Democratic senators want JCN to release the names of all its donors who have contributed more than $10,000 since 2017, its total number of donors since 2017, the total number of donations under $100 since 2017 and the percentage of donations made since 2017 by corporate entities and the names of those corporations.

Severino, in a statement, argued that the Democratic letter put their "hypocrisy on 'dark money' directly before the public."

"We assume their intention, however, is actually to try and distract the public from the continued deception on the part of their liberal 'dark money' allies and their secret list of potential judicial nominees post-2020 elections," she added.

The group began running an ad last week arguing that 2020 candidates should release a list of potential Supreme Court picks, similar to what President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE did during the 2016 campaign.

The ad referenced a recent New York Times article detailing efforts by outside liberal advocacy groups to game plan for judicial nominations after Trump leaves office. According to The New York Times, the groups do not plan to make their list of judges public. The article does not suggest that 2020 Democratic campaigns have put together a list of potential judicial nominations.

In addition to Schumer, Democratic Sens. Sheldon Whitehouse Sheldon WhitehouseThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime MORE (R.I.), Patrick Leahy Patrick Joseph LeahyBipartisan representatives demand answers on expired surveillance programs Democrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy MORE (Vt.), Dianne Feinstein Dianne Emiel FeinsteinTrump faces tricky choice on Supreme Court pick The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (Calif.), Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (Ill.), Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (R.I.), Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.), Amy Klobuchar Amy Klobuchar3 reasons why Biden is misreading the politics of court packing Social media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight MORE (Minn.), Christopher Coons Christopher (Chris) Andrew CoonsMurkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (Del.), Richard Blumenthal (Conn.), Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (Hawaii), Ed Markey Edward (Ed) John Markey3 reasons why Biden is misreading the politics of court packing Democrats shoot down talk of expanding Supreme Court Schumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement MORE (Mass.), Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (N.J.) and Kamala Harris Kamala HarrisHundreds of lawyers from nation's oldest African American sorority join effort to fight voter suppression Biden picks up endorsement from progressive climate group 350 Action 3 reasons why Biden is misreading the politics of court packing MORE (Calif.) signed the letter.