The Department of Justice sought to dismiss a lawsuit fired FBI agent Peter Strzok filed claiming he was denied due process and should be reinstated as chief of the counterespionage division.

Documents released Monday by the DOJ reveal a batch of 'security violations' and 'unprofessional conduct' by Strzok – including keeping FBI documents on his personal electronic devices that his wife could have potentially accessed, Fox News reported.

The motion to dismiss the lawsuit claimed Strzok could not succeed on any of his claims. The document insisted that his key role within the agency on some of its highest-profile investigations 'imposed on him a higher burden of caution with respect to his speech.'

FBI Deputy Director David Bowdich fired Strzok on August 10, 2018 – overruling a decision by the FBI Office of Professional Responsibility, which previously decided Strzok should be demoted and suspended for 60 days.

The Justice Department dismissed a lawsuit filed by former-FBI agent Peter Strzok (pictured) where he claimed he did not receive due process before his firing

The motion to dismiss the lawsuit claimed Strzok could not succeed in his claims, insisting that his key role within the agency 'imposed on him a higher burden of caution with respect to his speech'

The DOJ included an August 2018 letter in its court filing that the department's Office of Professional Responsibility (OPR) sent to Strzok that found he engaged in a 'dereliction of supervisory responsibility' by failing to investigate the potentially classified Hillary Clinton emails that turned up on an unsecured laptop belonging to then-Democratic Congressman Anthony Weiner.

Strzok claimed he 'double deleted' sensitive FBI materials on any personal devices, but the DOJ and OPR note his wife found evidence of his affair on his cell phone, raising speculation that he hadn't done a thorough job in protecting sensitive information.

Strzok's wife discovered on his personal cell phone that he was having an affair with former FBI agent Lisa Page, the same agent he exchanged anti-Trump messages with during and shortly after the 2016 presidential elections.

Melissa Hodgman, Strzok's wife, found photographs and hotel reservations she assumed were used for a 'romantic encounter.'

The former FBI agent also admitted that he sometimes used Apple's iMessage on his personal phone to conduct FBI work.

The situation with Strzok ahead of the 2016 elections concerned the New York case agent so much that he told federal prosecutors he was 'scared' and 'paranoid' that 'somebody was trying to bury this.'

The New York prosecutors then brought the concerns to the Justice Department, which led to then-FBI Director James Comey's announcement just ahead of Election Day revealing that emails possibly related to the Clinton probe were located on Weiner's laptop.

Strzok conducted professional business on personal devices, and exchanged anti-Trump messages with FBI agent Lisa Page (pictured) – who he was engaged in an affair with

Even though he claimed he 'double deleted' sensitive FBI materials on any personal devices, the DOJ noted that his wife, Melissa Hodgman (pictured), found evidence of his affair on his cell phone, raising speculation that he hadn't done a thorough job in protecting sensitive information

Strzok was accused of not investigating the allegations properly, supposedly to not damage Clinton – his preferred candidate – as she took on Donald Trump.

A slew of anti-Trump text messages sent between Strzok and Page were exchanged as Strzok oversaw the 2016 Clinton email investigation.

Also found on his personal phone was additional evidence of his affair with then-coworker Lisa Page.

'[My wife] has my phone. Read an angry note I wrote but didn't send you. That is her calling from my phone. She says she wants to talk to [you]. Said we were close friends nothing more,' one of his texts to Page read, according to the filing.

'Your wife left me a vm [voicemail]. Am I supposed to respond? She thinks we're having an affair. Should I call and correct her understanding? Leave this to you to address?' Page responded.

'I don't know. I said we were [] close friends and nothing more. She knows I sent you flowers, I said you were having a tough week,' Strzok continued in the charade.

Strzok, a veteran counterintelligence agent, led FBI investigations into Hillary Clinton's use of a private email server and ties between the Trump campaign and Russia.

He was, however, removed from then-Special Counsel Robert Mueller's team after his anti-Trump texts with Page came to light.

Strzok also used his government-issued devices to portray anti-Trump message.

He exchanged over 40,000 text messages on government-issued phones from August 2015 through May 2018, the motion said, and one of the messages called then-candidate Trump a 'disaster' and suggested '[w]e'll stop' him.

Republicans interpreted that specific text as Strzok claiming he would work to prevent Trump from being elected in 2016, but his lawsuit insists the message was actually meant to reassure Page that the American people would not support a Trump candidacy.

Strzok joined the FBI in 1998 and rose to deputy assistant director of the agency's counterintelligence division before his firing in August of last year.