White House aides are reportedly narrowing in on their search for who penned an anonymous New York Times op-ed purportedly by a senior Trump administration official.

The search for the author is down to a few possibilities, a source tells CNN. Kellyanne Conway Kellyanne Elizabeth ConwaySpecial counsel investigating DeVos for potential Hatch Act violation: report George and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death MORE separately said in an interview with CNN’s Christiane Amanpour 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 suspects the official is in the national security sector.

ADVERTISEMENT

Trump is reportedly “obsessed” with finding the author of the op-ed, CNN said, but White House chief of staff John Kelly John Francis KellyMORE has advised the president to avoid giving the piece further attention. The publication of the op-ed has roiled Washington.

Trump called on Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsGOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status MORE Friday to investigate the anonymous senior official’s identity, citing national security concerns.

“We’re going to take a look at what he had, what he gave, what he’s talking about also where he is right now,” Trump told reporters on Air Force One.

"It's national security," he added.

Over two dozen officials, including Vice President Pence and a number of Cabinet secretaries, have denied that they penned the op-ed.

The White House came out swinging against the piece, with Trump calling the author “gutless” and suggesting treason may have been committed. White House press secretary Sarah Huckabee Sanders called on the anonymous “coward” to resign.

The op-ed blasted Trump as “amoral” and “anti-Democratic” and detailed officials’ efforts to curb his “misguided impulses" from within the administration.

“The root of the problem is the president’s amorality. Anyone who works with him knows he is not moored to any discernible first principles that guide his decision making,” the anonymous official wrote.

“Meetings with him veer off topic and off the rails, he engages in repetitive rants, and his impulsiveness results in half-baked, ill-informed and occasionally reckless decisions that have to be walked back.”