President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE took aim at special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE during a sprawling campaign rally Tuesday to officially kick off his 2020 reelection bid, decrying the Russia probe as a "witch hunt" and swiping at former political foes such as Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE.

At a campaign rally in Orlando, Fla., the president cast Mueller’s investigation into Russia's election meddling and possible obstruction of justice as a Democratic-led effort to malign his presidency and relitigate the 2016 race between Trump and Clinton.

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“For the last 2 ½ years, we have been under siege,” he told an arena packed with supporters. “They want a do-over. No other president should have to go through this again. It is so bad for our great country. A hoax. A great hoax.”

“After two years, 1.4 million pages of documents, 500 search warrants, 500 witnesses, 2,800 subpoenas and 40 FBI agents working around the clock, what did they come up with? No collusion and the facts that led our great attorney general to determine no obstruction. No collusion. No obstruction.”

Mueller wrote in his final report that he found no proof of conspiracy between Trump and Moscow in Russia’s efforts to meddle in the election but declined to exonerate the president over whether he obstructed subsequent probes, outlining 10 “episodes” of possibly obstructive behavior. The special counsel declined to issue an indictment, citing existing Justice Department guidelines against charging a sitting president.

Attorney General William Barr Bill BarrHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Bipartisan representatives demand answers on expired surveillance programs YouTube to battle mail-in voting misinformation with info panel on videos MORE and former Deputy Attorney General Rod Rosenstein Rod RosensteinDOJ kept investigators from completing probe of Trump ties to Russia: report Five takeaways from final Senate Intel Russia report FBI officials hid copies of Russia probe documents fearing Trump interference: book MORE later declined to charge Trump with obstruction after reviewing Mueller’s underlying evidence.

“We went through the greatest witch hunt in political history. The only collusion was committed by the Democrats, the fake news media and their operatives, and the people who funded the phony dossier, crooked Hillary Clinton and the DNC," Trump said Tuesday.

"It was all an illegal attempt to overturn the results of the election, spy on our campaign, which is what they did,” the president said, referring to a dossier compiled by former MI6 operative Christopher Steele outlining alleged misconduct by Trump.

“We call it the Russian hoax,” the president added.

While Mueller's probe wrapped up earlier this year without any recommendation of charges, a growing number of House Democrats have called for impeachment proceedings to begin, citing findings laid out in the special counsel's report.

House Democrats have also continued a slew of oversight investigations into the administration, which Trump has repeatedly blasted, casting his administration as a victim of congressional overreach and claiming it as evidence that Democrats are solely focused on unseating him rather than passing legislative priorities.