Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) on Saturday ramped up pressure on Sen. Lindsey Graham Lindsey Olin GrahamSenate 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 (R-S.C.) to call on special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE to testify before the Senate.

"I will keep pushing Chairman Graham because he has an obligation to ask Mueller to come testify before the Judiciary Committee at a public hearing without constraints," Schumer tweeted.

Graham, who chairs the Judiciary Committee, pushed back this week on calls from Democrats to have Mueller appear before the Senate panel.

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But on Friday, the GOP chairman invited Mueller to testify about his phone call with Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon 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 McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE in which the two discussed Barr’s summary of the findings of Mueller’s probe into Russia's election meddling and possible obstruction of justice.

Graham wrote in a letter to Mueller that it would be an opportunity to testify about "any misrepresentation" of the call after Barr discussed it during an appearance in front of the Senate Judiciary Committee this week.

"Please inform the Committee if you would like to provide testimony regarding any misrepresentation by the Attorney General of the substance of that phone call," Graham said in the letter to Mueller.

Barr this week recounted a conversation he had with Mueller in late March after the attorney general sent a four-page letter to Congress summarizing the special counsel’s findings.

"The summary letter … did not fully capture the context, nature and substance of this office's work and conclusions," Mueller wrote in a letter to Barr on March 27.

However, Barr maintained that Mueller’s gripes were with the media coverage surrounding the summary, not the attorney general's letter itself.

"He was very clear with me that he was not suggesting that we had misrepresented his report," Barr told lawmakers.

Democrats have latched on to Mueller’s letter to Barr, saying it is evidence the attorney general misrepresented the special counsel’s conclusions as a way to defend the president.