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Special counsel Robert Mueller's report has been a long time in the making.

 by Deputy Attorney General Rod Rosenstein after President Trump 

Mueller, a former FBI director who had joined a top law firm after leaving government service, 

Comey confirmed earlier in 2017 that the FBI had opened an investigation into whether anyone on Trump's successful 2016 presidential campaign worked with the 

Mueller then took over with a team of prosecutors, investigators and other specialists brought in from the Justice Department, the intelligence community and the private sector.

A hall-of-mirrors atmosphere has reigned in Washington ever since as the capital waited on tenterhooks to see what Mueller would uncover -- and what that might mean politically for Trump.

Old roles were inverted as Republicans tore into federal law enforcement and complained about conspiracies and bias within 

 that the president and his allies attempted no less than to "burn down the entire FBI" in order to deflect attention from themselves.

Democrats, meanwhile, took up the mantle of law and order, championing the FBI and the intelligence community; Mueller himself 

Trump went back and forth as to what he accepted about the underlying interference by Russia in 2016, but he maintained throughout that neither he nor anyone in his campaign had anything to do with it.

The concept of collusion was a "hoax," and the investigation into what took place during the political cycle that elected him was a "witch hunt," Trump has said repeatedly.

https://twitter.com/realDonaldTrump/status/1104890307706060802

 what he called Democrats angry about the loss of an election in 2016 they believed they should have won. He and supporters also said they suspected a conspiracy within federal law enforcement that was out to get him.

Even as the Justice Department became a target of outsiders trying to help the president, its internal investigators found big problems of their own.

The deputy FBI director, Andrew McCabe, was fired

 after he was found to have "lacked candor" in talking about his dealings with the press in 2016. During multiple interviews in support of 

he intends to sue the Trump administration for wrongful termination

, among other things, because, in McCabe's view, he was singled out and personally targeted for his work on the FBI investigation.

Investigators also discovered that a senior FBI attorney, Lisa Page, and 

a senior counterintelligence agent, Peter Strzok

, exchanged a number of text messages on their work phones that were critical of Trump in 2016 as they worked on some of the bureau's most politically sensitive cases.

Strzok had been involved with the Russia investigation and moved for a time into the special counsel's office -- 

until the messages were discovered and he was removed from Mueller's team

The anti-Trump sentiment in the messages embarrassed the FBI and opened it up to months' worth of criticism about its fairness in the investigation. Some other DOJ or FBI officials caught up in the Russia imbroglio also were targeted or stepped down.

The president's GOP allies in Congress also sought more information from the Justice Department and FBI about the earlier phases of the investigation, before Mueller, arguing that it, too, showed bias or abuses of power.

 against the then-Republican leadership of the House Judiciary Committee, which demanded sensitive information about surveillance practices and the use of confidential informants during the 2016 phase of the inquiry.

Hanging above it all were questions about the 

 that played a role in at least one warrant obtained by FBI investigators to collect the communications of 

Carter Page, a 2016 Trump campaign foreign policy adviser

The FBI and the Justice Department treated the material in the dossier as trustworthy enough to pursue their own inquiries about it behind the scenes, but it became internationally notorious after 

an unredacted copy was published in early 2017

NPR has not detailed the contents of the dossier because it was and remains unverified, but the document became the centerpiece of a political war because of the explosive allegations it makes about Trump and his 2016 campaign.

Members of Congress attacked it and defended it, but only a few points about it have been established for certain. One is that investigators have verified only portions of what it says -- although precisely which portions remains classified. 

the dossier wasn't the origin of the Russia investigation

. By the time it came along, the FBI already had begun looking into reports from an Australian diplomat in London who said an American on Trump's campaign had told him the Russians had promised dirt on Hillary Clinton.

, a junior Trump campaign foreign policy aide, and inquiries into other members of the Trump camp, including campaign chairman 

 and another junior foreign policy adviser, Carter Page. 

all were convicted or have pleaded guilty

 in the course of the Russia investigation; Page so far has not faced any charge.

Through it all, however, Mueller and his staff did not get caught up in partisan warfare themselves -- they gave no interviews, convened no press conferences and kept almost all of their own secrets.

Mueller's office made less than a handful of public statements of any kind. Once, 

it defended the practices it was using to secure evidence

 that said it had documents that said Trump had instructed his onetime attorney Michael Cohen to lie to Congress.

Otherwise the special counsel's office was a black box about which Washington endlessly speculated, commentated and fulminated.

That meant that Rosenstein often was the public face of the Russia investigation, not Mueller. And it meant that the workings and intentions of the special counsel's office largely remained a cipher -- until the completion of its final report and 

Crime, Law and Justice

Politics and Government News

Special counsel Robert Mueller has been working for nearly two years to uncover how Russia attacked the 2016 presidential election and whether anyone in the U.S. was involved.

The Mueller report is getting a lot of attention. Here's how we got here

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