Former Director of National Intelligence James Clapper James Robert ClapperOn China, Biden is no Nixon — and no Trump The Hill's 12:30 Report - Speculation over Biden's running mate announcement Trump slams former intelligence officials to explain 'reluctance to embrace' agencies MORE said Monday that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s call for the Department of Justice (DOJ) to investigate whether or not the FBI conducted surveillance on his campaign was a "disturbing assault" on DOJ's independence.

Clapper, an appointee of President Obama's, argued Trump was effectively trying to make Justice an arm of the White House.

“I think that’s actually a very disturbing assault on the independence of the Department of Justice,” Clapper told CNN’s “New Day.”

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“And I think when the president — this president or any president — tries to use the Department of Justice as a kind of private investigatory body, that’s not good for the country.”

Ex-DNI Clapper: Trump's DOJ demand is "politicizing what is a legitimate activity, an important one on the part of the FBI." (via CNN) pic.twitter.com/XTS8Tj18kz — Kyle Griffin (@kylegriffin1) May 21, 2018

The Justice Department on Sunday night said it asked the inspector general to probe whether or not the FBI conducted surveillance on the Trump campaign for "inappropriate purposes,” a move that followed Trump’s tweet calling for Justice to look into the matter.

“I hereby demand, and will do so officially tomorrow, that the Department of Justice look into whether or not the FBI/DOJ infiltrated or surveilled the Trump Campaign for Political Purposes — and if any such demands or requests were made by people within the Obama Administration!” Trump wrote on Twitter.

Clapper criticized Trump for what he described as “politicizing” the FBI’s activities.

“This is not about spying on his campaign,” Clapper told CNN. “It’s about what the Russians are doing. Were they attempted to infiltrate the campaign?”