In the longest speech of his presidency, Mr Trump railed against the inquiry into alleged collusion between his campaign and Russia.
"We're waiting for a report by people who weren't elected," he told a crowd of cheering conservatives.
Mr Mueller is expected to hand in his report to the attorney general shortly. "Unfortunately, you put the wrong people in a couple of positions and they leave people for a long time that shouldn't be there and all of a sudden they are trying to take you out with bullshit, okay?" the president said.

President Donald Trump attacked special counsel Robert Mueller's credibility Saturday, disparaging former Attorney General Jeff Sessions and former FBI Director James Comey as Washington waits for Mueller's report in the coming weeks.

Special counsel is widely seen as in the final stages of his probe; a look at what could happen next

William Barr, 68, served as attorney general under president George HW Bush in the early 1990s. The US Senate has confirmed William Barr as attorney general, putting the longtime lawyer atop the Justice Department and putting him in charge of overseeing Special Counsel Robert Mueller's long-running probe of whether President Donald Trump's 2016 campaign colluded with Russia.

BUZZFEED WAS ONCE notorious for traffic-generating “listicles,” but has since become an impressive outlet for deep investigative journalism under editor-in-chief Ben Smith. That outlet was prominently in the news this week thanks to its “bombshell” story about President Trump and Michael Cohen: a story that, like so many others of its kind, blew up in its face, this time when the typically mute Robert Mueller’s office took the extremely rare step to label its key claims “inaccurate.”

In the wake of special counsel Robert Mueller taking the unprecedented step to publicly dispute reported allegations related to the Trump-Russia investigation, some in the media made it clear they are worried about potential blowback related to Mueller's announcement.

President Trump on Friday night slammed a BuzzFeed News report, which alleges the president has been implicated in a crime, saying its release marked a “very sad day for journalism” after Special Counsel Robert Mueller's team released a rare statement claiming the outlet got its facts wrong.

In a rare public statement, special counsel Robert Mueller's office on Friday disputed a blockbuster report from BuzzFeed News that alleged President Donald Trump directed his former attorney, Michael Cohen, to lie in his testimony before Congress.

The office of special counsel Robert Mueller used a rare statement on Friday night to dispute the report by BuzzFeed News that President Trump had instructed his former lawyer to lie to Congress.

Special counsel Robert S. Mueller III’s office on Friday denied an explosive report by BuzzFeed News that his investigators had gathered evidence showing President Trump directed his former lawyer, Michael Cohen, to lie to Congress about a prospective business deal in Moscow.