Seventy former senators drafted an open letter to current members of the chamber proposing a new bipartisan caucus amid the current era of aggressive partisanship.

These 70 former senators said Congress is “not fulfilling its constitutional duties" with “much of the responsibility” resting on the Senate. They write that the upper chamber is not functioning “as the Framers of the Constitution intended" in the letter, which was published by The Washington Post.

The letter's writers, who include former Sens. James Buckley (R-N.Y.), Joe Donnelly Joseph (Joe) Simon DonnellyMomentum growing among Republicans for Supreme Court vote before Election Day Barrett seen as a front-runner for Trump Supreme Court pick Ex-Sen. Joe Donnelly endorses Biden MORE (D-Ind.), Jeff Flake Jeffrey (Jeff) Lane FlakeJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Republican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style MORE (R-Ariz.), Heidi Heitkamp Mary (Heidi) Kathryn HeitkampCentrists, progressives rally around Harris pick for VP 70 former senators propose bipartisan caucus for incumbents Susan Collins set to play pivotal role in impeachment drama MORE (D-N.D.), John Kerry John Forbes KerryThe Memo: Warning signs flash for Trump on debates Divided country, divided church TV ads favored Biden 2-1 in past month MORE (D-Mass.) and Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.), lament what they call the disintegration of legislative authority, saying Congress over the years has given too much power to the executive and judicial branches.

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“The Senate’s abdication of its legislative and oversight responsibilities erodes the checks and balances of the separate powers that are designed to protect the liberties on which our democracy depends,” the senators wrote.

They also mourned that it takes 60 votes to “pass anything in the Senate” now, calling it “new and obstructionist” that the same number of votes for “the once relatively exceptional event of a filibuster” is now essentially needed to pass any legislation.

“By design, the Senate is the place where Americans with all their competing interests and ideologies are represented and where champions of those positions attempt to advance their causes and work through their differences,” they said.

The former senators said a bipartisan caucus of incumbents would allow senators to participate in “meaningful committee work.” They also ask that current senators push for legislation and compromise amid the partisan disagreements, acknowledging doing so could risk their careers but would “advance the cause of a ‘more perfect union.’”

“We, who once held the office you now hold and who are confident that service in the U.S. Senate is as high a calling for you as it was for us, will stand up for you against any partisan opposition. We will do so publicly and repeatedly in whatever available forums,” the 70 former senators wrote.

“The Senate — and the proper functioning of our Republic — are simply too important to be allowed to continue on their present course,” they added.