But the so-called "Midyear" team - the investigative unit that had handled the Clinton investigation - did not move to review them until just days before the end of the election, nearly a month after FBI officials in NY found them.
Former FBI Director James Comey "deviated" from standard FBI and Justice Department procedures in his probe into Hillary Clinton's email server use, according to the report from the inspector general, as seen by Bloomberg.
Trump was going to be briefed Thursday on the 500-page report, and the president was expected to use it to ramp up his attacks on Comey and the Justice Department. He has openly criticized how long it took the report to be published, by tweeting, "Numerous delays".
The inspector general's review months ago uncovered a trove of anti-Trump texts from Strzok, who famously called Trump an "idiot" and texted about an "insurance policy" against a Trump presidency.
The FBI has said that McCabe received ethics approvals and did not oversee the Clinton investigation at the time of the contributions. Trump has repeatedly claimed that Comey's investigation into Clinton was "phony and dishonest", claims that have now been shot down by his own administration. It is expected to also focus on Comey's decision to announce that the email probe was being reopened just days before the 2016 election.
Republicans on the House Judiciary and Oversight and Government Reform committees say they have "substantial questions about whether DOJ and Federal Bureau of Investigation properly analyzed and interpreted the law surrounding mishandling of classified information".
According to Fox News, Michael Horowitz' report includes text messages exchanged between DOJ employees in August 2016, when Strzok vowed to prevent the election of the GOP candidate.
Comey told investigators that he did not inform Main Justice officials because he was concerned they would instruct him not to do it - something he felt would have harmed the public's perception of the fairness and trustworthiness of the investigation.
That development unfolded as Trump's own campaign - unbeknownst at the time to the US public - also came under FBI investigation for possible co-ordination with Russian Federation. "Right?!" the lawyer, Lisa Page, wrote to Strzok.
The Justice Department's internal watchdog is releasing its much-anticipated report on the FBI's handling of the Hillary Clinton email investigation.
The report by the Justice Department's inspector general will be the latest bombshell in the seemingly never-ending fight over the 2016 election. The investigation focused on whether Clinton sent or received classified information through a server in the basement of her NY home, which was not authorized to handle such messages.