President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Wednesday took aim at top officials at the FBI as well as Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE and the Democratic National Committee (DNC), accusing them of conspiring to undermine his 2016 campaign and eventual presidency.

Trump tweeted that the dossier authored by former British intelligence agent Christopher Steele on behalf of Fusion GPS, a political intelligence firm, and provided to the FBI by Steele had been a "total fraud on your President and the American people!"

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"Wow! FBI made 11 payments to Fake Dossier’s discredited author, Trump hater Christopher Steele. ... The Witch Hunt has been a total fraud on your President and the American people!" he wrote.

"It was brought to you by Dirty Cops, Crooked Hillary and the DNC," Trump continued.

Wow! FBI made 11 payments to Fake Dossier’s discredited author, Trump hater Christopher Steele. @OANN @JudicialWatch The Witch Hunt has been a total fraud on your President and the American people! It was brought to you by Dirty Cops, Crooked Hillary and the DNC. — Donald J. Trump (@realDonaldTrump) April 17, 2019

Trump and his allies have argued for years that the dossier authored by Steele on the president's ties to Russia, which has not been fully verified, was the impetus for the FBI's initial investigation of the Trump campaign begun under the Obama administration, which Trump has claimed led to illegal spying on his campaign.

The president's reelection campaign echoed those claims over the weekend, falsely telling supporters in a fundraising email that Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE had revealed "unlawful" surveillance on the Trump campaign.

"Attorney General William Barr said what the president has thought all along: He believes 'unlawful spying did occur' against Donald J. Trump's presidential campaign," read the fundraising email.

Barr told a Senate Appropriations subcommittee hearing last week that he believes "spying" did occur on the Trump campaign, but made no determination as to whether it was conducted legally.

“I think spying did occur,” the attorney general said. “But the question is whether it was adequately predicated and I’m not suggesting it wasn’t adequately predicated, but I need to explore that.”

"I am not saying that improper surveillance occurred. I'm saying that I am concerned about it and looking into it. That's all," he added.