Sen. Dianne FeinsteinDianne Emiel FeinsteinSenate confirms Rosen for No. 2 spot at DOJ Senate confirms controversial 9th Circuit pick without blue slips Graham warns of 5G security threat from China MORE (D-Calif.) is asking Attorney General William Barr to hand over special counsel Robert MuellerRobert (Bob) Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe MORE's full report on the Russia probe by April 1. 
 
Feinstein, the top Democrat on the Senate Judiciary Committee, sent Barr a letter on Monday giving the attorney general a week to hand over the report, which details Mueller's two-year investigation and findings, to Democrats on the panel. 
 
"A four-page summary of Special Counsel Mueller’s extensive investigation and report, with no underlying evidence or findings, is not adequate to accomplish our constitutional, legislative, and oversight responsibilities," Feinstein wrote. 
 
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Feinstein added that she has "several questions and request a full copy of the report and underlying evidence on behalf of the Judiciary Democrats."

In addition to setting the April 1 deadline for handing over Mueller's report, Feinstein is also asking Barr to start producing underlying documentation from the investigation on the same day.

Feinstein was one of four lawmakers Barr sent the four-page letter outlining the principal findings of Mueller's investigation to on Sunday. But Democrats immediately clamored for Barr to make the entire report public. 
 
Sen. Lindsey GrahamLindsey Olin GrahamTrump, Europe increasingly at odds on Iran Trump: Anonymous news sources are 'bulls---' Trump: 'Good chance' Dems give immigration 'win' after Pelosi called White House plan 'dead on arrival' MORE (R-S.C.), the chairman of the Judiciary Committee, told reporters on Monday that Barr agreed to testify before the panel and that Barr was currently talking with Mueller about what in his report should or should not be released. 
 
In addition to Feinstein's April 1 deadline, top House Democrats have asked Barr to hand the Mueller report over to Congress by April 2, next Tuesday.  The six House committee chairs, in a separate letter on Monday, said Barr's initial summary "leaves open many questions."

Mueller turned his report over to the Justice Department on Friday, signaling the formal end of the two-year investigation. 

Mueller, according to the letter, did not uncover evidence that the Trump campaign conspired or coordinated with the Russian government to interfere in the 2016 election.