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 again railed against 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’s probe on Saturday, labeling it “a Democrat Con Job” while also calling for investigators to look into former Democratic presidential nominee 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’s emails.

“The Rigged Witch Hunt, originally headed by FBI lover boy Peter S (for one year) & now, 13 Angry Democrats, should look into the missing DNC Server, Crooked Hillary’s illegally deleted Emails, the Pakistani Fraudster, Uranium One, Podesta & so much more,” Trump tweeted.

The Rigged Witch Hunt, originally headed by FBI lover boy Peter S (for one year) & now, 13 Angry Democrats, should look into the missing DNC Server, Crooked Hillary’s illegally deleted Emails, the Pakistani Fraudster, Uranium One, Podesta & so much more. It’s a Democrat Con Job! — Donald J. Trump (@realDonaldTrump) July 7, 2018

Trump was referring to FBI agent Peter Strzok, who was involved in the agency’s investigations into Clinton’s use of a private email server as secretary of State and Russian meddling in the 2016 election.

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Months after Mueller's investigation started, Strzok was removed from Mueller’s probe last year after it was discovered that he had exchanged anti-Trump text messages with another FBI staffer, Lisa Page. He is set to testify before the House Judiciary and Oversight and Government Reform committees in a joint hearing next week.

Trump has repeatedly attacked Mueller's investigation, calling it a "witch hunt" and claiming that it is biased against him.

He claimed in another tweet earlier Saturday that "[p]ublic opinion has turned strongly against" Mueller and his probe.