Eight Democratic Senators who previously served as prosecutors renewed calls for an FBI investigation of allegations that Supreme Court nominee Brett Kavanaugh committed assault in high school.

Sens. Amy Klobuchar Amy KlobucharSocial media platforms put muscle into National Voter Registration Day Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE (D-Minn.), Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.), Patrick Leahy Patrick Joseph LeahyDemocrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (D-Vt.), Sheldon Whitehouse Sheldon WhitehouseFeinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Hillicon Valley: Murky TikTok deal raises questions about China's role | Twitter investigating automated image previews over apparent algorithmic bias | House approves bill making hacking federal voting systems a crime House approves legislation making hacking voting systems a federal crime MORE (D-R.I.), Richard Blumenthal (D-Conn.), Doug Jones (D-Ala.), Tom Udall Thomas (Tom) Stewart UdallLWCF modernization: Restoring the promise OVERNIGHT 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 MORE (D-N.M.) and Catherine Cortez Masto Catherine Marie Cortez MastoHillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars Senators introduce bipartisan bill to mandate digital apps disclose country of origin Democratic Senate campaign arm raised nearly M in August MORE (D-Nev.) sent a letter to President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE Thursday.

The signatories identified themselves as former prosecutors and attorneys general.

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“The allegations now before us include a number of issues that would ordinarily be addressed by law enforcement,” they wrote. “One of these is the fact that the allegations mention multiple witnesses who may have relevant information to share in an interview. Another is that there are reports of medical evidence and a polygraph test which should be reviewed.”

The senators argued law enforcement professionals would be better suited than committee staff currently leading the investigation to review the evidence.

Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyThe Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy Read: Senate GOP's controversial Biden report MORE (R-Iowa) argued in a letter made public Wednesday that it is the Senate’s constitutional responsibility to investigate information related to a nominee and that the role of the FBI is to look into confidential matters only.

“The Constitution assigns the Senate, and only the Senate, with the task of advising the president on his nominees and consenting if the circumstances merit,” Grassley wrote in the letter to Judiciary Committee Democrats. “The job of assessing and investigating a nominee’s qualifications in order to decide whether to consent to the nomination is ours, and ours alone.”

Democrats argued in their letter to Trump Thursday that the FBI investigated sexual harassment allegations Anita Hill made against then-Supreme Court nominee Clarence Thomas in 1991.

“That decision was praised by Republican senators including Sen. Hatch, who called it the ‘right thing to do,’ and the FBI finished its work in three days,” the Democrats wrote, referring to Sen. Orrin Hatch Orrin Grant HatchBottom line Bottom line Senate GOP divided over whether they'd fill Supreme Court vacancy MORE (R-Utah), one of three Judiciary panel members who participated in Thomas’s confirmation hearings.

Grassley, however, dismissed that precedent in his letter Wednesday.

He noted that the FBI’s investigation of Hill’s allegations occurred before they became public, arguing the role of the FBI in conducting background investigations is “to compile information in a confidential manner.”

“In 1991, the FBI’s additional investigation into Professor Anita Hill’s allegations occurred when the allegations were still non-public,” he wrote.

But Democrats are disputing that argument.

“Career law enforcement officers have specialized training and expertise in this area, and when new evidence emerges, law enforcement professionals regularly follow up on those developments. This process — including collecting information in a thorough and impartial manner — is how our justice system works,” they wrote.