Fox's Bartiromo: DOJ, FBI, IRS, CIA 'were all involved in trying to take down Donald Trump'

Fox Business Network host Maria Bartiromo said Monday that then-President Obama "politicized all of his agencies" in an effort "to take down Donald TrumpDonald John TrumpPossible GOP challenger says Trump doesn't doesn't deserve reelection, but would vote for him over Democrat O'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms MORE."

"President Obama, basically, it appears to me, politicized all of his agencies: the [Department of Justice] DOJ, the FBI, the IRS, the CIA," Bartiromo said on her Fox Business program, "Mornings with Maria." 

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"They were all involved in trying to take down Donald Trump," she added.

She made the comments to Fox senior judicial analyst Andrew Napolitano, who responded by referring to a tweet sent by former CIA Director John BrennanJohn Owen BrennanWebb: Questions for Robert Mueller A brief timeline of Trump's clashes with intelligence director Dan Coats Trump critic Brennan praises his Iran decision: I 'applaud' him MORE

Brennan, now an NBC News and MSNBC contributor, on Sunday responded to an earlier Trump tweet demanding a DOJ investigation into whether or not "the FBI/DOJ infiltrated or surveilled the Trump Campaign for political purposes."

Brennan warned Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellAre Democrats turning Trump-like? House Democrat calls for gun control: Cities can ban plastic straws but 'we can't ban assault weapons?' Churches are arming and training congregants in response to mass shootings: report MORE (R-Ky.) and Speaker Paul RyanPaul Davis RyanEmbattled Juul seeks allies in Washington Ex-Parkland students criticize Kellyanne Conway Latina leaders: 'It's a women's world more than anything' MORE (R-Wis.) that they'll each "bear major responsibility for the harm done to our democracy" if they "continue to enable Mr. Trump's self-serving actions."

"One of the reasons, I think, that [former CIA Director] John Brennan’s tweet was so vicious in tone, was because he does not want this behavior exposed,” Napolitano said on Monday. “He probably was behind it — and in fairness to him, it went on long before he got there and will go on long after he is gone.”

Deputy Attorney General Rod RosensteinRod RosensteinWhy the presumption of innocence doesn't apply to Trump McCabe sues FBI, DOJ, blames Trump for his firing Rosenstein: Trump should focus on preventing people from 'becoming violent white supremacists' MORE — who has been rumored for months to be on the president's chopping block — announced not long after Trump's tweet on Sunday that the Department of Justice Inspector General will launch an investigation into if politics were involved in the FBI investigation of Trump in 2016.