White House Declines Comment on Fired Twitter Troll Jofi Joseph

Jofi Joseph was fired following his outing as @NatSecWonk.

A smartphone display shows the Twitter logo in Berlin, Germany.
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The White House declined to comment specifically Wednesday on an Obama administration employee who was behind an anonymous Twitter account that spent years disparaging national security policy and administration officials.

[WATCH: Michele Bachmann Blames Shutdown on Obama's Tweets]

According to a report by the Daily Beast, Jofi Joseph, a national security staffer, was recently fired following an internal investigation into the source behind the Twitter handle "@NatSecWonk."

"Two administration officials confirmed that the mystery tweeter was Joseph, who has also worked at the State Department and on Capitol Hill for Senators Bob Casey, D-Pa., and Joe Biden," according to the Daily Beast.

The account was created in February 2011 and just recently ceased tweeting and has since been deleted.

In an email statement to Politico, Joseph admitted he was behind the account.

"It has been a privilege to serve in this administration and I deeply regret violating the trust and confidence placed in me," he wrote to Politico. "What started out as an intended parody account of D.C. culture developed over time into a series of inappropriate and mean-spirited comments. I bear complete responsibility for this affair and I sincerely apologize to everyone I insulted."

Joseph's statement following his identity being made public strikes a different tone than that of his anonymous account.

"I'm abrasive and bring the snark. Unapologetically says what everyone else only thinks. A keen observer," was the description listed by the account, according to New York Magazine.

White House spokesman Jay Carney declined to comment on Joseph or the situation specifically, but did outline the social media constraints for White House officials.

[READ: Obama Taps Top Defense Lawyer as Homeland Security Chief]

"Unless you have an authorized official social media or Twitter account, as some of us do, White House employees are not able to access social media sites like that at all for personal use," he said during his press briefing. "You can't go on Twitter and sign up for an account through White House equipment."

Joseph was involved in nuclear non-proliferation issues, and most recently participated in talks with Iran regarding nuclear weapons. Carney said Joseph was a state department employee "on loan" to the White House.

New York Magazine, citing tweets from the account catalogued on Google, also noted many of Joseph's vitriol was directed at disparaging women.

"[Liz Cheney is ] what happens when rank nepotism meets sheer stupidity. Also, she takes after her father -- she's like 30 pounds overweight," Joseph once Tweeted.

His physical critiques weren't limited to one party, either.

"Who are the two blondes flanking [Chelsea Clinton]? And is it just me, or has she put on some weight?" he Tweeted.

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