WASHINGTON — Some of the more than one dozen current and former White House officials who cooperated with special counsel Robert Mueller are worried that the version of his report expected to be made public on Thursday will expose them as the source of damaging information about President Donald Trump, according to multiple witnesses in the investigation.

Some of the officials and their lawyers have sought clarity from the Justice Department on whether the names of those who cooperated with Mueller's team will be redacted or if the public report will be written in a way that makes it obvious who shared certain details of Trump's actions that were part of the obstruction of justice probe, people familiar with the discussions said. But, they said, the Justice Department has refused to elaborate.

Of particular concern is how Trump — and his allies — will react if it appears to be clear precisely what specific officials shared with Mueller, these people said.

"They got asked questions and told the truth and now they're worried the wrath will follow," one former White House official said.

Some of those who spoke with Mueller's team, such as former White House counsel Don McGahn, witnessed Trump's actions up close and were privy to key moments in the obstruction investigation and spent many hours with investigators.

One person close to the White House said there is "breakdown-level anxiety" among some current and former staffers who cooperated with the investigation at the direction of Trump's legal team at the time.

There is also concern that new facts in the report could be disclosed that do not reflect favorably on the president, two people familiar with the discussions said.

"You have a whole bunch of former White House officials and current White House officials, but especially former White House officials, who were told to cooperate," the former White House official said. "So people went and did that, and now the uncertainty is just how much of that information is going to be in that report and how identifiable to individuals is it going to be. And nobody knows."

22 PHOTOS Robert Mueller See Gallery Robert Mueller WASHINGTON, DC - OCTOBER 28: Former FBI director Robert Mueller attends the ceremonial swearing-in of FBI Director James Comey at the FBI Headquarters October 28, 2013 in Washington, DC. Comey was officially sworn in as director of FBI on September 4 to succeed Mueller who had served as director for 12 years. (Photo by Alex Wong/Getty Images) US President Barack Obama applauds outgoing Federal Bureau of Investigations (FBI) director Robert Mueller (L) in the Rose Garden at the White House in Washington on June 21, 2013 as he nominates Jim Comey to be the next FBI director. Comey, a deputy attorney general under George W. Bush, would replace Mueller, who is stepping down from the agency he has led since the week before the September 11, 2001 attacks. AFP PHOTO/Nicholas KAMM (Photo credit should read NICHOLAS KAMM/AFP/Getty Images) Outgoing FBI Director Robert Mueller applauds key staff members during a farewell ceremony held for him at the Justice Department in Washington, August 1, 2013. On Monday the U.S. Senate confirmed former Deputy Attorney General James Comey to replace Mueller, who has led the bureau since shortly before the September 11, 2001, attacks on the United States. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS CRIME LAW HEADSHOT) 391489 03: U.S. President George W. Bush speaks during a conference as he stands with Justice Department veteran Robert Mueller, left, who he has nominated to head the FBI, and Attorney General John Ashcroft July 5, 2001 the Rose Garden at the White House in Washington, DC. (Photo by Mark Wilson/Getty Images) Outgoing FBI Director Robert Mueller stands for the national anthem during a farewell ceremony for him at the Justice Department in Washington, August 1, 2013. 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REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS CRIME LAW) UNITED STATES - JUNE 19: Chairman Pat Leahy, D-Vt., right, and FBI Director Robert Mueller make their way to a Senate Judiciary Committee hearing in Dirksen Building on oversight of the FBI. (Photo By Tom Williams/CQ Roll Call) Outgoing FBI Director Robert Mueller (C) delivers remarks at a farewell ceremony for him at the Justice Department in Washington, August 1, 2013. On Monday the U.S. Senate confirmed former Deputy Attorney General James Comey to replace Mueller, who has led the bureau since shortly before the September 11, 2001, attacks on the United States. Also onstage with Mueller are Deputy U.S. Attorney General James Cole (FROM L), U.S. Attorney General Eric Holder, former CIA Director George Tenet and TSA Administrator John Pistole. REUTERS/Jonathan Ernst (UNITED STATES - Tags: POLITICS CRIME LAW) WASHINGTON, DC - MAY 15: (L-R) Rep. Steny Hoyer (D-MD), U.S. Attorney General Eric Holder, Homeland Security Secretary Janet Napolitano, FBI Director Robert Mueller and Immigration and Customs Enforcement Director John Morton attend the National Peace Officers' Memorial Service at the U.S. Capitol May 15, 2013 in Washington, DC. Holder and other members of the Obama administration are being criticized over reports of the Internal Revenue Services' scrutiny of conservative organization's tax exemption requests and the subpoena of two months worth of Associated Press journalists' phone records. (Photo by Chip Somodevilla/Getty Images) FBI Director Robert Mueller testifies before the House Judiciary Committee hearing on Federal Bureau of Investigation oversight on Capitol Hill in Washington June 13, 2013. Mueller said on Thursday that the U.S. government is doing everything it can to hold confessed leaker Edward Snowden accountable for splashing surveillance secrets across the pages of newspapers worldwide. REUTERS/Yuri Gripas (UNITED STATES - Tags: POLITICS CRIME LAW) Ukrainian President Viktor Yanukovych (L) welcomes FBI Director Robert Mueller during their meeting in Kiev June 5, 2013. REUTERS/Efrem Lukatsky/Pool (UKRAINE - Tags: POLITICS) FBI Director Robert Mueller (L) arrives for the Obama presidential inauguration on the West Front of the U.S. Capitol January 21, 2013 in Washington. President Barack Obama was re-elected for a second term as President of the United States. Woman at right is unidentified. REUTERS/Win McNamee-POOL (UNITED STATES) WASHINGTON, : FBI Director Robert Mueller answers questions before Congress 17 October 2002 on Capitol Hill in Washington. Mueller was testifying before the House and Senate Select Intelligence committees' final open hearing investigating events leading up to the September 11, 2001. AFP Photos/Stephen JAFFE (Photo credit should read STEPHEN JAFFE/AFP/Getty Images) (L-R) CIA Director Leon Panetta, Director of National Intelligence James Clapper and FBI Director Robert Mueller testify at a Senate Intelligence Committee hearing on Capitol Hill in Washington, February 16, 2011. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS) 399994 02: Federal Bureau of Investigation (FBI) Director Robert Mueller visits the American military compound at Kandahar Airport January 23, 2002 in Kandahar, Afghanistan. Mueller had lunch with FBI officials and Haji Gulali, commander of the Kandahar region. (Photo by Mario Tama/Getty Images) Federal Bureau of Investigation (FBI) Director Robert Mueller (L) stand during the National Anthem alongside Attorney General Eric Holder (R) and Deputy Attorney General James Cole (C) during a farewell ceremony in Mueller's honor at the Department of Justice on August 1, 2013. Mueller is retiring from the FBI after 12-years as Director. AFP PHOTO / Saul LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images) 399994 01: Federal Bureau of Investigation (FBI) Director Robert Mueller greets American forces on the American military compound at Kandahar Airport January 23, 2002 in Kandahar, Afghanistan. Mueller had lunch with FBI officials and Haji Gulali, commander of the Kandahar region. (Photo by Mario Tama/Getty Images) UNITED STATES - JUNE 19: FBI Director Robert Mueller, center, talks with Chairman Pat Leahy, D-Vt., right, and Sen. Orrin Hatch, R-Utah, talk before a Senate Judiciary Committee hearing in Dirksen Building on oversight of the FBI. (Photo By Tom Williams/CQ Roll Call) UNITED STATES - JUNE 06: OVERSIGHT HEARING ON COUNTERTERRORISM--Sen. Richard J. Durbin, D-Ill., Senate Judiciary Chairman Patrick J. Leahy, D-Vt., FBI Director Robert S. Mueller III, and Sen. Charles E. Grassley, R-Iowa, before the hearing. (Photo by Scott J. 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Another person familiar with the discussions said the officials who are worried are those who said negative things about Trump. This person said the "million-dollar question" swirling around Trump world is how much of the report will be redacted, specifically if it will be a "net plus or minus" 100 pages of the more than 300-page report.

Fueling officials' concern is that Attorney General William Barr hasn't been clear about what the report might entail. Barr has said he wants to make as much of the report public as he can, while also making clear parts of it will be redacted for grand jury testimony, classified information and material that could affect ongoing investigations. He also said information that could "infringe on the personal privacy" and reputations of "peripheral third parties" could be redacted, a phrase unclear to some witnesses in the investigation.

"Even if names are redacted or names aren't in the report to begin with, it could be situations people were asked about and they answered truthfully that at least for some people — specifically the president — would be identifiable because the situation applies to just one person," the former White House official said. "Nobody has any idea what this is going to look like on Thursday."

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