Former U.S. Attorney Preet Bharara Preetinder (Preet) Singh BhararaDemocratic attorneys criticize House Judiciary Democrats' questioning of Barr Clyburn echoes calls to rename Pettus bridge Support swells for renaming Edmund Pettus Bridge in Selma to honor John Lewis after his death MORE joked Wednesday that 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's "excuse" for not testifying before the House Judiciary Committee rhymes with "snitty."

"Bill Barr’s excuse for not testifying in the House tomorrow rhymes with 'snitty,'" tweeted Bharara, who served as U.S. Attorney for the Southern District of New York before being fired by 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.

Bill Barr’s excuse for not testifying in the House tomorrow rhymes with “snitty.” — Preet Bharara (@PreetBharara) May 2, 2019

Bharara's tweet appeared to reference Barr's description of a letter sent to him by 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 in March. Barr said while testifying before the Senate Judiciary Committee on Wednesday that Mueller's letter to him voicing frustrations with Barr's summary of the special counsel’s principal conclusions was "a bit snitty."

"And I think it was probably written by one of his staff people," he told the panel.

Mueller expressed in a March 27 letter to Barr that his initial memo "did not fully capture the context, nature, and substance of this Office's work and conclusions," according to a letter released by the House Judiciary Committee on Wednesday.

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Barr has been the subject of increased scrutiny from Democrats over his handling of Mueller's report on his investigation into Russia's election interference and whether Trump obstructed justice.

The attorney general was expected to appear before the House Judiciary Committee for a second round of questioning from lawmakers on Thursday, but the Justice Department said Barr would not appear for the hearing because of the "unprecedented and unnecessary" conditions imposed by the committee's chairman, Rep. Jerrold Nadler (D-N.Y.).

A Justice Department spokesperson said Nadler's insistence on having committee counsels question Barr after members grilled him was "inappropriate."

House Democratic Caucus Chairman Hakeem Jeffries (D-N.Y.), a member of the Judiciary Committee, said Democrats would subpoena Barr if he failed to show up for the hearing.