Almost a year before he turned in his report, Mueller warned that much of the coverage of his probe wasn't true

Yuri Gripas / Reuters

Robert Mueller.

• Special Counsel Robert Mueller warned that much of the coverage of his probe into Russian meddling in the 2016 wasn't accurate almost a year before he turned in his report.
• The attorney general's summary of the report on Sunday poured cold water on claims that Mueller could prove collusion, devastate Trump, or even kick off an impeachment process.
• The investigation found that neither Trump nor his presidential campaign conspired or colluded with Russia, though it did not exonerate him of potentially obstructing justice.
• Comments from former officials, Democrats, and even Trump allies had suggested that the report would be much more damaging for the president.

Almost a year before turning in his report on Russian meddling in the 2016 presidential election and President Donald Trump's campaign, Special Counsel Robert Mueller warned that much of the coverage of his probe wasn't accurate.

A spokesman for Mueller's office issued a statement in April 2018that said "many" stories about his investigation "have been inaccurate."

The statement warned reporters to "be very cautious about any source that claims to have knowledge about our investigation and dig deep into what they claim before reporting on it."

It was a rare statement from an office that has remained almost silent as the world's media closely followed the investigation, and often relied on anonymous sourcing to characterize what Mueller and his staff were doing.

The statement said to journalists: "If another outlet reports something, don't run with it unless you have your own sourcing to back it up."

Read more: Mueller found that there was no Trump-Russia conspiracy but did not 'exonerate' the president on obstruction

Trump has claimed victory as his staunchest critics were left disappointed by Attorney General William Barr's summary of the Mueller report, which was delivered to Congress on Sunday.

In the summary, Barr found that neither Trump nor his presidential campaign conspired or colluded with Russia to influence the election.

But Mueller did not reach a conclusion as to whether Trump obstructed justice, and Mueller also said that "while this report does not conclude that the President committed a crime, it also does not exonerate him."

AP Photo/Alex Brandon

President Donald Trump speaks with the media after stepping off Marine One at the White House on Sunday.

Democrats are fighting to get the full report made public, while a number of other investigations into Trump and his Russian connections continue.

But the immediate effect of the report dropping was to puncture expectations that the report could prove collusion, lead to high-level indictments, and potentially even end Trump's presidency.

Journalist Glenn Greenwald, a long-term critic of the idea that Mueller's report would prove collusion, tweeted on Sunday that outlets like CNN and MSNBC had committed a "massive error" in their reporting.

And Tim Graham, director of media analysis for the conservative Media Research Center, was cited by The Washington Post being similarly dismissive.

He said: "liberal journalists expected Mueller to build a case for scandalous collusion between the Trump campaign and the Russian government."

Read more: Barr's summary of the Mueller report is out. Here are the key Trump-Russia questions we still don't have answers to.

"So now it's apparent the news channels merely channeled their wishful thinking. They had a grand denouement in mind, and it didn't happen. They mocked Trump for saying 'no collusion,' and that ended up being the truth."

Former officials, Democrats, and even Trump stoked claims that the Mueller report could be devastating for Trump

Much of the reporting that Mueller could prove a heavy blow to Trump was based on predictions and comments from Democrats and former officials who spoke about the investigation.

Former CIA Director John Brennan suggested to MSNBC in March that a member of the Trump family could be weeks from getting.

Alan Dershowitz, a Harvard law professor who has frequently defended Trump, predicted in November that the report would be "politically very devastating," though he did not think it would result in criminal charges.

Tasos Katopodis/Getty Images

Special Counsel Robert Mueller walks after attending church on Sunday after delivering his report on alleged Russian meddling in the 2016 presidential election.

Top Democrats said that Trump could be jailed or impeached as part of the investigations into him.

And Trump's own lawyer, Rudy Giuliani, left open the possibility that Trump's 2016 election campaign could have colluded with Russian operatives when speaking to CNN in January.

These comments continued to fuel a narrative that Mueller's report would find evidence of collusion, potentially devastate Trump, and could even provide evidence that could kick off an impeachment process.

Read more: Democratic presidential candidates are leading calls for the Mueller report to be made public

Dean Baquet, the executive editor of The New York Times, answered questions about his paper's coverage, by saying that stories it published about Russians trying to contact Trump were "true."

"On Russia interference, we and others wrote extensively about Russia's attempt to influence the election, both through hacking and direct approaches by Russians to people around candidate Trump," Baquet told the Post.

Alex Wong/Getty Images

Robert Mueller is sworn in during a hearing before the House Judiciary Committee in June 2013.

"Those stories were true", Baquet said. "And nothing has happened to call into question the reporting about Donald Trump's financial history, or the use of his charity, or any of the other fine investigative reporting over the past three years."

"I'm comfortable with our coverage. It is never our job to determine illegality, but to expose the actions of people in power. And that's what we and others have done and will continue to do."

Mueller's office has largely stayed quiet about reports on the probe. But it did dispute a January BuzzFeed News report that said Mueller had evidence that Trump directed Michael Cohen to lie to Congress, which the outlet stands behind.

"BuzzFeed's description of specific statements to the Special Counsel's Office, and characterization of documents and testimony obtained by this office, regarding Michael Cohen's Congressional testimony are not accurate," spokesman Peter Carr said in a statement to INSIDER.

And outlets like Politico and The Atlantic warned months ago that the final report may ultimately be just a short summary, and that Mueller would likely stay quiet afterward.

• Read more coverage of the publication of the Mueller report:

• Pelosi and Schumer charge that Attorney General William Barr is 'not in a position to make objective determinations' about the Mueller report

• 'Now we FIGHT BACK!': The Trump re-election campaign is using the attorney general's Mueller summary to raise funds

  The House Judiciary Committee will call Attorney General William Barr to testify about the Mueller report

  Mueller's report found no conspiracy between the Trump campaign and Russia- here are all the known contacts between the campaign and Russian government-linked people or entities

  Here's Attorney General William Barr's summary of Mueller's report on the Russia investigation