Former Attorney General Eric Holder Eric Himpton HolderThe Hill's Campaign Report: Trump's rally risk | Biden ramps up legal team | Biden hits Trump over climate policy Biden campaign forming 'special litigation' team ahead of possible voting battle Pompeo, Engel poised for battle in contempt proceedings MORE said Monday that "we're really at the beginning, maybe the middle" of questions about whether President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE obstructed justice.

Holder made the remark during an interview on MSNBC, one day after Attorney General William Barr said in a letter to Congress that 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 did not reach a conclusion while investigating whether Trump obstructed justice.

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Barr also said in the letter that he and Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE determined there was insufficient evidence that Trump obstructed justice.

Holder on Monday called for more detailed findings from Mueller's report to be released publicly.

“With regard to obstruction, I think we're really at the beginning, maybe the middle of this whole process. Findings have been made. We need to see what those were. We need to see exactly what was the nature of the interaction between Bob Mueller and Bill Barr," he said.

“And then we also need to understand, how was it that Bill Barr reached these conclusions? What were the things that he went through? What laws did he apply? What rules did he apply? How did he interpret the appropriate rules and statutes? How did he apply the facts," Holder continued.

"I think we're really at the beginning, maybe the middle of this whole process"@EricHolder on "obstruction question" pic.twitter.com/xrRceWTwXi — TheBeat w/Ari Melber (@TheBeatWithAri) March 25, 2019

Holder added during the interview that Congress and the American people "are entitled to hear substantially more" than Barr's letter to Congress.

"This is just a 4-page memo that makes really consequential determinations and it seems to me that the American people and Congress are entitled to hear substantially more than simply this document," Holder said.