A trio of Senate Democrats are asking Justice Department watchdogs to probe potential talks between 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 and White House staff about investigations spinning off from 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's Russia investigation.

Sens. Richard Blumenthal (D-Conn.), 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.) and Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii) sent a letter to Justice Department Inspector General Michael Horowitz and Office of Professional Responsibility Director Corey Amundson on Monday asking them to investigate if Barr shared the names of spinoff cases with White House staff.

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"It would be highly inappropriate if Mr. Barr did in fact share case names with, and by default revealed the identity of, any defendants in those cases to the White House, particularly given that those same cases have been shielded from public view in the Special Counsel’s report," the senators wrote in the letter.

Barr told members of the Senate Judiciary Committee last week that he had not had "substantive" talks with White House staff about the 14 cases Mueller referred to the Justice Department but that "it’s possible a name of a case was mentioned."

The three senators added in their letter that discussing case names could "interfere" with the ongoing investigations, which they argued "could implicate the conduct of individuals in the White House, including the president, his family, and his business associates."

The senators are requesting that the Justice Department officials find out if any "improper communications" have occurred between the White House and Justice Department, including in regard to the Mueller spinoff cases.

"Specifically, we request that you investigate whether Mr. Barr revealed any names of any of the 14 cases referred by Special Counsel Mueller, or the defendants in those cases, to the White House, as his testimony before our Committee indicated," they wrote.

If they find that Barr discussed names of cases with White House staff, the senators want to know whom he discussed them with and if he discussed any other details of the cases with White House officials, including Trump.