Brett Kavanaugh’s nomination is in limbo as the Senate awaits the results of an eleventh hour investigation by the FBI into the sexual assault allegations that have roiled the Supreme Court fight.

GOP leadership and the White House made a political U-turn late last week when they called for the law enforcement agency to reopen its background investigation and look into “credible” allegations.

The move came after several moderate senators, led by retiring Sen. 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.), said they wanted a vote on Kavanaugh to be delayed for up to a week to give the FBI time to investigate, a day after Kavanaugh and Christine Blasey Ford, the first woman to publicly accuse Kavanaugh, testified in an emotionally fraught hearing before the Senate Judiciary Committee.

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It’s a significant shift for Republicans, who have dismissed that the FBI needed to investigate the alleged sexual misconduct and noted the agency already did six background checks into Kavanaugh.

But Republicans hold a slim 51-49 majority in the Senate and with other GOP senators, including Lisa Murkowski Lisa Ann MurkowskiSenate GOP aims to confirm Trump court pick by Oct. 29: report Senate GOP sees early Supreme Court vote as political booster shot Pence defends Trump's 'obligation' to nominate new Supreme Court justice MORE (Alaska) and Susan Collins Susan Margaret CollinsSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (Maine), backing Flake, Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Senate GOP aims to confirm Trump court pick by Oct. 29: report Trump argues full Supreme Court needed to settle potential election disputes MORE (R-Ky.) likely could not have moved his nomination without making a deal.

Under the weeklong delay, Kavanaugh’s nomination could be held up until Friday, though Flake acknowledged that there is a chance the FBI could wrap up their work ahead of schedule.

Flake told CBS News’s “60 Minutes” that Kavanaugh’s nomination and the allegations against him are “tearing the country apart.”

“I just knew that we couldn’t move forward, that I couldn’t move forward without hitting the pause button, because what I was seeing, experiencing, in an elevator and watching it in committee and just thinking this is tearing the country apart,” Flake said.

Flake told reporters on Friday that by calling for a delay so the FBI could investigate he wanted a “better process.” But there are already signs that both sides are digging in as they await the update to Kavanaugh’s background investigation.

Sources with knowledge of the matter told NBC News that the White House is limiting the scope of the FBI's investigation into sexual assault allegations leveled against Kavanaugh.

The sources said the FBI’s investigation will focus on Ford and Deborah Ramirez, who claims that Kavanaugh exposed himself to her when they were both students at Yale University.

The FBI, according to NBC News, has not been permitted to investigate Julie Swetnick's claims that Kavanaugh engaged in sexual misconduct in high school. Republicans have largely dismissed Swetnick’s claims as politically motivated.

The report sparked outrage from Democrats who worry that the White House will try to micromanage the investigation in an effort to protect Kavanaugh.

“To limit the FBI as to the scope and who they’re going to question … that’s not the kind of investigation that all of us are expecting the FBI to conduct," Democratic Sen. Mazie Hirono Mazie Keiko HironoDemocrats unveil plan declaring racism a public health issue Overnight Defense: US, Russia trade blame over Syria incident | Pentagon calls out China's 'counterproductive' military exercises, missile test | Democrats press Esper on COVID-19 response Democrats press Esper on 'concerning' rise in Pentagon's COVID-19 cases MORE (Hawaii), a member of the Judiciary Committee, told ABC News’s “This Week.”

Meanwhile, Sen. Dianne Feinstein Dianne Emiel FeinsteinBiden leads Trump by 12 points among Catholic voters: poll Names to watch as Trump picks Ginsburg replacement on Supreme Court McConnell says Trump nominee to replace Ginsburg will get Senate vote MORE (Calif.), the top Democrat on the Judiciary Committee, sent a letter on Sunday requesting a copy of the directive given from the White House to the FBI that outlines the scope of the investigation.

The White House and Republicans hit back on Sunday, arguing that Democrats are trying to move the goalposts on Kavanaugh’s nomination.

Trump in a tweet on Sunday argued that an investigation will “never be enough” for Democrats.

"Just starting to hear the Democrats, who are only thinking Obstruct and Delay, are starting to put out the word that the 'time' and 'scope' of FBI looking into Judge Kavanaugh and witnesses is not enough," Trump wrote.

Meanwhile, Sen. Tom Cotton Tom Bryant CottonGOP brushes back charges of hypocrisy in Supreme Court fight Trump uses bin Laden raid to attack Biden Battle lines drawn on precedent in Supreme Court fight MORE (R-Ark.), a close ally of the president’s in the Senate, said on Sunday that lawyers for Ford and Feinstein would be investigated because of Ford’s letter being leaked. Feinstein has repeatedly denied that she leaked the letter.

"Those lawyers are going to face a D.C. bar investigation into their misconduct. ... Dianne Feinstein and her staff is going to face an investigation for why they leaked that,” he told CBS News.

Cotton is not a member of the Senate Ethics Committee and did not specify who he believes will investigate Feinstein.

The partisan back-and-forth comes as Kavanaugh still remains short of the simple majority needed to be confirmed to the Supreme Court.

Collins and Murkowski remain undecided. Flake announced last week he would support Kavanaugh and said over the weekend that unless the FBI finds something he expects to support him.

Republicans can only afford to lose one GOP senator before they need help from Democrats to confirm Kavanaugh.

Three Democrats — Sens. Joe Manchin Joseph (Joe) ManchinThe Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (W.Va.), Joe Donnelly Joseph (Joe) Simon DonnellyTrump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court Momentum growing among Republicans for Supreme Court vote before Election Day MORE (Ind.) and 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 (N.D.) — supported Neil Gorsuch, Trump’s first Supreme Court nominee.

Donnelly announced last week that he would oppose Kavanaugh. Manchin and Heitkamp remain undecided.

FAA

The Senate is expected to take up a long-term reauthorization of the Federal Aviation Administration (FAA).

Senators passed a one-week extension of the program on Friday, giving them until Oct. 7 to clear the House-passed legislation that would fund the agency for five years after missing the original Sept. 30 deadline.

The bill provides funding and puts in place new safety regulations, including changes to the rest and duty rules for pilots and flight attendants. It also creates minimum dimensions for legroom on commercial flights and bans airlines from involuntarily removing passengers after boarding.

The legislation provides $1.68 billion in disaster relief for areas impacted by Hurricane Florence.

Opioids

The Senate has gotten a deal to take up House-passed legislation to fight the country’s opioid epidemic.

Under an agreement between McConnell and Senate Minority Leader Charles Schumer Chuck SchumerSenate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' Jacobin editor: Primarying Schumer would force him to fight Trump's SCOTUS nominee MORE (D-N.Y.), at a time to be determined the Senate will take up the bill and have up to four hours of debate.

The bill passed the House in a 393-8 vote last week and once it passes the Senate will head to Trump’s desk.

The legislation includes a package of bills to fight the opioid crisis, including lifting some limits on Medicaid paying for care at addiction treatment facilities and cracking down on illicit opioids being imported by mail and fueling the crisis across the United States.