Sen. Susan Collins Susan Margaret CollinsThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Gideon leads Collins by 12 points in Maine Senate race: poll Senate leaders quash talk of rank-and-file COVID-19 deal MORE is lobbying her colleagues to keep the legislative filibuster in place after Republicans used the "nuclear option" to change the rules for Supreme Court nominees.

The Maine Republican was spotted circulating a letter among her colleagues while senators were stuck on the floor for more than an hour and a half earlier Thursday.

On Thursday afternoon, Republicans voted to get rid of the 60-vote filibuster for Supreme Court nominees, doing away with the need for the higher procedural hurdle and allowing nominees to clear the Senate with a simple majority.

Collins is pushing to get her colleagues on the record that they will not use the same tactic for legislation, even though leadership says there is no intention of taking such a step.

"It's going to kick me in the bottom to work harder to be working with colleagues across the aisle," she said, asked about the fallout from Thursday's votes. "We have to be an institution that functions with one another. I do not want the Senate to be the House."

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Murkowski added that "it puts it upon me and those who work really hard to be bipartisan, to be more bipartisan."

Not all of Murkowki's colleagues were as positive.

Reid, former Democratic leader, led Democrats to "go nuclear" and lower the threshold for lower-court and executive nominees in 2013.

"After seeing what I've seen from the last couple of weeks ... I'm off, I'm not signing anything," he said.

Pressed if he wants to get rid of the legislative filibuster, which requires 60 votes to take up or end debate on a bill, Corker assured reporters that he did not.

"No, no, no, no," he said, asked if he would support getting rid of the filibuster. "[But] it's the next step along the way."

No senator has specifically called for the legislative filibuster to be nixed, and senators in both parties have said this week that they don't support getting rid of it.

"There's not a single senator in the majority who thinks we ought to change the legislative filibuster," he said during a weekly leadership press conference. "We all understand that's what makes the Senate the Senate."

"[It] puts as many of us as possible on record as saying we would not support the elimination of the legislative filibuster," she said.