The Justice Department inspector general, Michael Horowitz, announced last week that his office would release its report Thursday - which is also Trump's birthday.
The report by the Justice Department inspector general on the FBI's and DOJ's handling of the Hillary Clinton email investigation examines decisions made during the investigation by top FBI officials, including former director James Comey.
He has also expressed hope that the report will validate his decision to fire James Comey by providing evidence of Comey's incompetence.
The report is also critical of the former attorney general, though sources could not provide further details.
But the report could do more to back Democratic claims that the FBI actually contributed to Trump's victory, most notably by reopening in the final days of the race its investigation into whether Clinton mishandled classified information. White House officials have not yet confirmed that Rosenstein will be conducting the briefing. He has openly criticized how long it took the report to be published, by tweeting, "Numerous delays".
Comey told investigators he used his laptop and personal email when he needed "to word process an unclassified [document] that was going to be disseminated broadly", like a speech or an email to the whole organization, according to the report.
Strzok's and Page's names first made headlines a year ago, when it emerged that they exchanged several text messages that demonstrated pro-Clinton and anti-Trump political views. There's a reason Comey got a book out early.
Deputy Attorney General Rod Rosenstein was spotted entering the West Wing on Thursday.
Republican critics seized on revelations from the inspector general that two FBI officials who worked on Special Counsel Robert Mueller's Russian Federation investigation, Peter Strzok and Lisa Page, exchanged text messages sharply critical of Trump. Cases that end without charges are rarely discussed publicly.
He said the report will lay out the "pathway" that led to Comey's decisions, but will not challenge his prosecutorial discretion in terms of giving immunity to witnesses or not prosecuting Clinton.
Lynch described that meeting as a chance encounter unrelated to the case, but Clinton's critics seized on it to question Lynch's objectivity. But it will mark the most definitive accounting of the email probe to date, looking at - among other things - whether "certain underlying investigative decisions were based on improper considerations".
Comey has said he felt compelled to alert Congress to the new emails, after having previously testified that the investigation was done. Mueller removed Strzok from the inquiry after the texts were discovered, and Page has since left the Federal Bureau of Investigation. As a candidate, Mr. Trump was fixated on the 30,000 personal emails that Clinton deleted from her tenure as secretary of state, saying that Clinton should have been prosecuted for her "illegally deleted emails". Trump has repeatedly cited the contributions in denouncing McCabe. The FBI's own reports leave no real doubt about that.