Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll The 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 MORE’s (R-Ky.) decision to rebuke the Senate’s most prominent liberal woman has significantly raised the temperature in what was already a ­red-hot chamber of Congress.

The partisan back-and-forth between McConnell and Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE (D-Mass.) was the culmination of weeks of simmering tension over President Trump’s Cabinet nominees and the latest indication that bipartisanship will be elusive in 2017.

Senate Republicans aren’t regretting the unusual Tuesday night vote to suspend Warren from the debate on Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE’s (R-Ala.) nomination to serve as attorney general, even though it caused a media firestorm and energized the Democratic base.

For McConnell, it was about defending a colleague and friend with whom he has served since 1997 and firing a warning shot at Democrats.

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Frustrations have steadily mounted within the GOP conference over Democratic maneuvers that have slowed the confirmation of Trump’s Cabinet nominees to a crawl. In addition to bogging down McConnell’s timeline, Democrats have raised a variety of questions about the ethics and competence of the nominees.

Warren, who is viewed as a top-tier 2020 presidential candidate, is usually very selective about her media interviews and generally does not engage with reporters in the Senate hallways. But on Wednesday, she went on a media blitz, which included interviews with CNN, MSNBC, ABC’s “The View” and The Hill.

“The rules are designed so that we can have tough debates about difficult issues without impugning one another’s motives,” said Sen. Marco Rubio Marco Antonio RubioHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Fla.). “I promise you, if the Senate becomes a place where people routinely insult one another, Americans aren’t going to be happy.”

A senior GOP aide said, “Senate Republicans were not going to allow Democrats to turn the Senate floor into a forum for invective against a sitting member of this chamber.”

The level of partisanship in the Senate has been on the rise over the last several years, but some contend that 2017 could be the nastiest year in recent memory. For example, Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah) called his Democratic colleagues “idiots” for not showing up to confirmation hearings, and Senate Minority Leader Charles Schumer Chuck SchumerDemocrats scramble on COVID-19 relief amid division, Trump surprise Pelosi, Schumer 'encouraged' by Trump call for bigger coronavirus relief package Schumer, Sanders call for Senate panel to address election security MORE (D-N.Y.) was one of only six Democrats to reject Elaine Chao to head the Transportation Department. Chao is McConnell’s wife.

Not one Republican member on Tuesday voted against the motion to invoke Rule 19 of the chamber, which prohibits senators from impugning the motives of a colleague. The 49-43 party-line roll call promptly ended Warren’s ability to speak about Sessions on the floor.

Sen. Steve Daines, an affable Republican from Montana, was presiding over the chamber and issued a warning when Warren quoted a 1986 statement from the late Sen. Edward Kennedy (D-Mass.) calling Sessions’s prior service as U.S. attorney a “disgrace” to the Justice Department.

After Warren went ahead and read a 30-year-old letter from Coretta Scott King accusing Sessions of “reprehensible conduct,” alleging that as a U.S. attorney he tried to intimidate African-Americans into not voting, McConnell came to the floor to invoke the rules.

Republicans say Democrats have treated Sessions badly since the moment Trump nominated him and point to Warren as one of the primary instigators of their hardball strategy.

Immediately after Trump tapped him, Warren told her colleagues “there can be no compromise with racism; no negotiation with hate,” a reference to allegedly racist statements Sessions made decades ago as U.S. attorney for the Southern District of Alabama.

That call to arms put pressure on other Democrats to put up a fight against Trump’s nominees and led to one of the most contentious nomination process in recent memory. Only five of Trump’s Cabinet nominees had been confirmed as of Wednesday afternoon. President Obama had 12 confirmed at the same point in his first term, and President George W. Bush had 14.

Session was confirmed in a vote of 52-47 Wednesday evening.

Democratic tactics have irritated Republicans, specifically Sen. Richard Blumenthal (D-Conn.) asking Sessions at his confirmation hearing whether he ever received an award from the Ku Klux Klan and Sen. Cory Booker’s (D-N.J.) testimony against his nomination before the Judiciary panel — an unprecedented effort by a senator to derail the nomination of a sitting colleague.

“I think decorum is important in the House and the Senate,” said Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican 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 Bush endorsing Biden? Don't hold your breath MORE (R-Ariz.), a former member of the House. “I hope if I ever disparage any of my colleagues on the Senate floor, I hope somebody calls me on it.”

GOP aides said there was also growing pressure from their base to stand up to Democratic “obstructionism.”

“Our own side is asking, ‘Why don’t you stand up and fight for the integrity of an honorable man?’ ” said the Republican aide. “If we didn’t stand up for him, what was our base going to say?”

The effect on the liberal base, however, appeared to be more pronounced and gave Warren a lot of free press on Wednesday. Many prominent Democrats, including 2016 presidential nominee Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The 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 MORE, came to her defense.

McConnell’s statement justifying the discipline — “She was warned. She was given an explanation. Nevertheless, she persisted.” — became a rallying cry for the left. On Wednesday afternoon, #ShePersisted was the top or second-highest trending hashtag on Twitter.

The Daily 202, a political blog published by The Washington Post, wrote that McConnell had given Warren’s possible 2020 presidential campaign “an in-kind contribution.”

Larry Sabato, the director of the University of Virginia’s Center for Politics, suggested that McConnell in Machiavellian fashion had intentionally helped Warren reap a media bonanza because he thinks she would be relatively easy for Trump to beat if he faces her in the 2020 general election.

“This is a strategic player,” he said of McConnell. “It could not have possibly escaped him that telling the most prominent woman senator [to] sit down and shut up while reading a letter from Coretta Scott King would promote her among Democrats.

“Who do the Republicans say they’d like to run against in 2020? Elizabeth Warren is usually the first name mentioned,” he added. “They think she’s too far to the left and they have a lot of ways to beat her.”

He said McConnell had elevated Warren above other Democratic White House hopefuls, a handful of whom are serving in the Senate.

When asked about this theory, Warren in an interview with The Hill said, “I don’t know how I feel about that,” adding, “I think you have to ask [McConnell].”

Liberal Democrats said if that’s what McConnell’s motive was, they’re elated to see Warren’s political stock rise.

“God bless him,” said Sen. Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (D-Ore.), one of the Senate’s most liberal members. “May he elevate the progressive wing because I think it’s resonating powerfully with Americans.”

Sen. Tom Udall Thomas (Tom) Stewart UdallOVERNIGHT ENERGY: House Democrats tee up vote on climate-focused energy bill next week | EPA reappoints controversial leader to air quality advisory committee | Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' Senate Democrats demand White House fire controversial head of public lands agency OVERNIGHT ENERGY: Trump extends Florida offshore drilling pause, expands it to Georgia, South Carolina | Democrats probe Park Service involvement in GOP convention | Sanders attacks 'corporate welfare' to coal industry included in relief package MORE (D-N.M.), another progressive, thinks the explanation for McConnell’s disciplining of Warren is relatively simple.

“Elizabeth Warren gets the Republicans’ blood boiling. She’s hard-hitting and speaks her mind,” he said.

Republican senators on Wednesday defended McConnell. But they weren’t thrilled with the messy fight, which only further energized Democrats who on Tuesday evening appeared a little weary after conducting an all-night talkathon to protest Betsy DeVos’s nomination for secretary of Education.

Rubio said the decision to rebuke Warren was “borderline,” and Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) said it would have been preferable if a vote could have been avoided.

On Wednesday morning, several male Democratic colleagues read King’s letter on the Senate floor and did not receive any discipline.

Pressed on whether there is a double standard for her, Warren demurred and said, “Ask Mitch McConnell.”