He said: "We're going to take a look at what he (the writer) had, what he gave, what he's talking about also where he is right now".
US President Donald Trump on Friday urged his attorney general to investigate the anonymous author of a damning op-ed, escalating his long-running battles with both the media and leaks from the White House.
"This could be very risky if the person who is talking to the media is actually revealing national security secrets", he added.
The piece's author, identified as a "senior administration official", said he is part of a resistance within the administration dedicated to "thwarting" parts of Trump' agenda and the president's "worst inclinations".
The president has raged against the essay since The Times published it on Wednesday afternoon, setting off a frenzy of speculation in the capital about the identity of the author and prompting a parade of denials from cabinet members and other prominent officials in the Trump administration.
Indeed, the piece seemed written deliberately to send the president down a nasty rabbit hole with rants and recriminations - the exact behavior to which the unknown author objected.
"The Deep State and the Left, and their vehicle, the Fake News Media, are going insane - & they don't know what to do. They're not doing us a favor by actively promoting 90% of the insane stuff coming out of this White House and saying, 'Don't worry, we're preventing the other 10%'".
Trump also said Friday that he was still open to answering questions from special counsel Robert Mueller in his investigation of Russian interference in the 2016 presidential election.
Critics say they insisted on hiring inside-the-Beltway bureaucrats and Bush administration veterans instead of firm Trump supporters for hundreds of executive branch jobs.
"I mean, that is really remarkable", he said, before joking: "And I have to say, I'm surprised by how good a writer Ivanka is".
The author also wrote that the "root of the problem is the President's amorality" and assails Trump's "reckless decisions", "erratic behaviour" and what the official describes as the President's "impetuous, adversarial, petty and ineffective" leadership style.
We should find out who it is because why should we live with somebody in the White House who is really subversive in a sense?
Trump has gone as far as to call the letter treasonous in his first tweet critical of the piece. Ditto Trump's attempts to make nice with Russian Federation, which the author said steady hands in the bureaucracy have undermined.
North Korean hacker responsible for Bangladesh Bank heist
The WannaCry cyberattack took place in 2017 when the ransomware infected about 300,000 computers. The complaint said there was no evidence Lockheed was breached.
Tesla shares fall after Elon Musk smokes weed, drinks whisky during interview
Tesla is now worth roughly $US21 billion less than it was in the immediate aftermath of Musk's infamous "funding secured" tweet. Tesla stocks tumbled this week after CEO Elon Musk appeared to smoke pot in a podcast, and top executives left the company.
Tiger fails to break par in 2nd round of BMW
Two of his birdies came on the par-5s, and another at the par-4 11th where he knocked an approach shot from 95 yards to 2 feet. After beginning the day tied for the lead, Woods fell to a tie for 10th five behind leader Xander Schauffele .