"For the sake of our national security, the New York Times should publish his name at once".
-Associated Press writer Zeke Miller.
Since it was released, the op-ed has sparked a parlor guessing game about its author's identity that perhaps hasn't been seen in Washington D.C. since Joe Klein wrote Primary Colors.
Since its publication, the piece has caused many to question who this senior official is, and the speculation has prompted countless officials, now including Hassett, to deny having authored the piece.
Mr Trump, a Republican, sought to portray the op-ed as a reflection of yet more anger by Democrats who have never accepted his surprise 2016 presidential election win.
The author was described as a senior administration official, a title that could apply to hundreds of people scattered across scores of agencies in Washington.
James Dao, the op-ed editor for the Times, said in the paper's Daily podcast on Thursday, "There's nothing in the piece that strikes me as being relevant to or undermining the national security". And this person -according to The New York Times - chose not only to stay but to undermine what President Trump and this administration are trying to do.
Airstrike near U.S. base in southeastern Syria kills 8 pro-Assad fighters
Last year, they had designated Idlib as a "de-escalation" zone where violence would halt in preparation for a countrywide ceasefire.
Secretary of State Mike Pompeo spoke on the issue during his visit to India.
Senior officials in key national security and economic policy roles charged the article's writer with cowardice, disloyalty and acting against America's interests in harsh terms that mimicked the president's own words.
"The Deep State and the Left, and their vehicle, the Fake News Media, are going insane - & they don't know what to do", he tweeted on Thursday morning. "It is laughable to think this could come from the secretary", spokesman Tony Sayegh said on Twitter.
Jodi Kantor, an investigative reporter with the New York Times, tweeted: 'So basically: Times reporters now must try to unearth the identity of an author that our colleagues in Opinion have sworn to protect with anonymity?
Trump immediately slammed as "gutless" the unsigned op-ed - published a day after excerpts from bombshell book claiming that White House staff were constantly battling to rein in the president's worst impulses.
The MSNBC contributor claimed that Trump wants to arrest whoever it is that wrote the piece, though it is not clear what charges could be brought against someone for sharply criticizing the president.