Trump suggests political bias to blame in Clinton email report's delay

"What is taking so long with the Inspector General's Report on Crooked Hillary and Slippery James Comey. Numerous delays. Hope Report is not being changed and made weaker! There are so many horrible things to tell, the public has the right to know. Transparency!" Trump tweeted.

The much-anticipated report is not directed at reviewing Clinton's actions, but will examine former FBI Director Comey and other senior officials at the Justice Department and FBI under the Obama administration. It will include a review of whether "certain underlying investigative decisions were based on improper consideration."

A draft of the report has been completed, sources with knowledge of the matter told CNN last month, and has been sent to lawyers for the various individuals criticized in it so that they can review it with their clients and submit rebuttal points for consideration. Many submitted their feedback to the inspector general last week, the sources said.

Its public release is expected any day.

The report, which is headed by Inspector General Michael Horowitz and was launched in January 2017, has the potential to deliver the stiffest blow for officials who formerly occupied the highest positions within the FBI and Justice Department.

One potential preview of Horowitz's findings on decisions by Comey was already outlined in a blistering memo written by Deputy Attorney General Rod Rosenstein, which detailed the ways Comey broke with long-standing department protocols and customs in the Clinton email investigation. Rosenstein's memo, controversial in its own regard, was initially used to rationalize firing Comey, but then Trump later said he would have done it regardless of Rosenstein's memo, and has since defended his decision as a "great honor."