Sen. Dianne Feinstein Dianne Emiel FeinsteinTrump faces tricky choice on Supreme Court pick The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (D-Calif.) is doubling down on her demand for the National Archives to hand over documents tied to Supreme Court nominee Brett Kavanaugh's tenure in the George W. Bush White House.

Feinstein, in a letter released on Tuesday, urged archivist David Ferriero to reconsider the agency's decision to not respond to Democratic requests for documents from Kavanaugh's work as a staff secretary to Bush.

"I am alarmed that you would deny Committee Democrats the materials necessary to fulfill their constitutional duty to provide advice and consent, while providing the materials requested by the Republicans. I urge you to reconsider your position," Feinstein wrote in the letter, which was sent to Ferriero on Monday.

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Feinstein's request comes after Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) also urged Ferriero in a phone call to reconsider the agency's position, which effectively stonewalls Democrats from getting Kavanaugh's staff secretary documents without help from Republicans.

But Ferriero, saying he had consulted with general counsel and the Department of Justice, rebuffed Schumer in a letter sent late last week.

The National Archives “remains unable to respond to [Presidential Records Act] special access requests from ranking minority members,” wrote Ferriero, who was appointed by former President Obama.

Feinstein countered in her letter that Ferriero was being "overly restrictive" and ignoring a senator's "express constitutional duty to provide advice and consent, which your analysis does not take into account."

"That outcome conflicts with the plain language and intent of the Presidential Records Act, which specifically recognizes the need for Congress to have special access to presidential records for such purposes," she added.

"These records are crucially important to the Senate’s understanding of Mr. Kavanaugh’s full record, and withholding them prevents the minority from satisfying its constitutional obligation to provide advice and consent on his nomination," Feinstein continued.

Feinstein's letter is the latest in a weeks-long fight over documents tied to the three-year period Kavanaugh worked as a staff secretary in the White House.

Democrats argue the documents are crucial to understanding Kavanaugh's thinking on some of the Bush administration's most controversial policies, including domestic surveillance as well as interrogation tactics now widely viewed as torture.

But Republicans have dismissed the request as a "fishing expedition," countering that Kavanaugh's roughly 12 years on the bench sheds light on his legal philosophy.

Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa) sent a letter to the National Archives requesting documents solely from Kavanaugh's time as a White House lawyer.

Grassley and Feinstein also sent a letter last week requesting documents from Kavanaugh's work on the 1990s investigation, led by Kenneth Starr, into then-President Clinton.