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Members of the group include the Alliance for Justice, the Brennan Center for Justice, Common Cause, Communications Workers of America, Sierra Club and the United Automobile, Aerospace and Agricultural Implement Workers of America.

Reid has threatened to use the so-called “constitutional option,” also known as the “nuclear option,” to change Senate rules next year. He is not pushing to end the filibuster completely, instead seeking limits on how and when it can be used.

President Obama backed Reid’s call for filibuster reform on Wednesday, but the idea faces strong resistance from Republicans and even some Democrats. Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellCongress had a good couple of weeks — now let's keep it going McCarthy: 'The Mueller investigation has got to stop' McConnell: Mueller 'ought to wrap it up' MORE (R-Ky.) has warned that a majority vote to change Senate rules would poison the well for negotiations on the deficit.

A group of junior Democratic senators has sponsored legislation to end the filibuster on the motion to proceed and to instate a talking filibuster, which would require senators to remain constantly on the floor while filibustering. 

“Fix the Senate Now” has endorsed both plans, along with limiting debate on nominations. 

While most incoming Democratic senators have signed on to rules reform, Sen. Tom UdallThomas (Tom) Stewart UdallOvernight Energy: Spending bill targets Pruitt | Ryan not paying 'close attention' to Pruitt controversies | Yellowstone park chief learned of dismissal through press release Senate committee targets Pruitt scandals in spending bill Overnight Energy: DNC to reject fossil fuel donations | Regulators see no security risk in coal plant closures | Senate committee rejects Trump EPA, Interior budgets MORE (D-N.M.) — who has spearheaded reform efforts — said earlier this month he didn’t yet have the votes needed to change the rules next year.