Giuliani predicts Mueller case is ‘going to blow up on them’

President TrumpDonald John TrumpTrump nominates ambassador to Turkey Trump heads to Mar-a-Lago after signing bill to avert shutdown CNN, MSNBC to air ad turned down by Fox over Nazi imagery MORE's lawyer Rudy Giuliani said late Wednesday that special counsel Robert Mueller's investigation could be over by September and predicted it is "going to blow up on them." 

"The real story is not that this case isn’t going to fizzle," he told Fox News host Sean Hannity during a discussion of why Mueller's terms for an interview with Trump were rejected. "It's going to blow up on them. The real question is, what we talked about before, there's a lot more to what they did that nobody knows about yet."

Giuliani added there is "a lot more to the obstruction of justice, to the collusion, to the fake dossier," referring to the controversial dossier compiled by former British intelligence agent Christopher Steele. 

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Giuliani often falsely claims that Mueller's probe started with the dossier, which contains unverified allegations about Trump's ties to Russia. 

"Can it get any worse?" Giuliani said. "I mean, what ... we need to know [is] that this is a totally illegitimate investigation based on a report, a dossier that was paid for by Hillary ClintonHillary Diane Rodham ClintonOvernight Defense: Trump declares border emergency | .6B in military construction funds to be used for wall | Trump believes Obama would have started war with North Korea | Pentagon delivers aid for Venezuelan migrants Sarah Sanders says she was interviewed by Mueller's office Trump: I believe Obama would have gone to war with North Korea MORE and the Democrats — probably the biggest illegality so far, the biggest collusion so far." 

"Completely made up," he added. "Led to nothing except several fraudulent FISA [Foreign Intelligence Surveillance Act] wires." 

Deputy Attorney General Rod RosensteinRod Jay RosensteinEx-federal prosecutor: I would have 'owned' wearing a wire to record Trump The embarrassing return of Andrew McCabe The Hill's Morning Report — Presented by the American Academy of HIV Medicine — Trump, Congress prepare for new border wall fight MORE appointed Mueller as special counsel to investigate possible ties between the Trump campaign and Russia after Trump fired former FBI Director James ComeyJames Brien ComeyMcCabe's 25th Amendment comments 'taken out of context,' spokeswoman says Ex-federal prosecutor: I would have 'owned' wearing a wire to record Trump Ex-federal prosecutor: 'Thank God' Whitaker is gone, Barr will bring 'integrity' back to DOJ MORE in 2017. 

Giuliani on Fox called the Mueller probe "a different kind of Watergate."

"I believe that when this plays out over the next year or two, it's not going to be about President Trump," Giuliani said. "It’s going to be about all the things they did." 

"My sources are telling me that when the American people get to the bottom of all of this, it will shock the heart, the soul, and the mind of any fair-minded American," Hannity replied. 

Giuliani has said in recent days that Trump's legal team is nearing the end of negotiations over an interview between Mueller and the president.