Special counsel Robert Mueller's report has been a long time in the making.
Mueller was appointed in the spring of 2017 by Deputy Attorney General Rod Rosenstein after President Trump fired FBI Director James Comey.
Mueller, a former FBI director who had joined a top law firm after leaving government service, was commissioned to investigate:
"any links and/or coordination between the Russian government and individuals associated with the campaign of President Donald Trump; and any matters that arose or may arise directly from the investigation."
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 Russians who had attacked the election.
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 a "deep state" they said was trying to frame Trump.
Comey complained 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 became a cult figure for Trump opponents who lit prayer candles, silk-screened T-shirts that said "It's Mueller Time" or waited until their last breath for his report to be completed.
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.
“There’s not one shred of evidence that President Trump has done anything wrong.” @GrahamLedger One America News. So true, a total Witch Hunt - All started illegally by Crooked Hillary Clinton, the DNC and others!
— Donald J. Trump (@realDonaldTrump) March 10, 2019
The president blamed 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 a new book, McCabe said 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.
Rosenstein fought a rearguard action 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.
npr.org