Eric Holder: 'We're really at the beginning' of questions about Trump obstructing justice

Former Attorney General Eric HolderEric Himpton HolderFormer Bush assistant: Mueller report makes Obama look 'just plain bad' Holder: Any 'competent' prosecutor could win obstruction case against Trump Meghan McCain to Sunny Hostin on Assange defense: 'Straight propaganda!' MORE said Monday that "we're really at the beginning, maybe the middle" of questions about whether President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference 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 MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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 RosensteinRod Jay RosensteinKellyanne Conway: Mueller didn't need to use the word 'exoneration' in report Impeachment? Not so fast without missing element of criminal intent Collins: Mueller report includes 'an unflattering portrayal' of Trump 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.

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.