He claimed that he was "100 per cent confident" that no one on his staff was involved with the anonymous column.
The piece, in the New York Times, said that Mr Trump's "erratic behaviour would be more concerning if it weren't for unsung heroes in and around the White House".
"The truth of the matter is over the last eight years despite what we heard from President Obama on Friday, I mean this country was struggling".
The anonymous editorial was published on Wednesday by the New York Times and attributed to a "senior" administration official.
"To have an individual who took that oath - literally say that they work every day to frustrate the president advancing the agenda he was elected to advance, is undemocratic". "It's not just deceitful, but it's really an assault on our democracy and that person should do the honorable thing, step forward and resign".
Swedish election: Nationalists 'make gains' in early exit polls
However, it may be apparent in other countries, too, albeit masked by voting systems that encourage two party systems. Some of their campaign promises include leaving the European Union and putting a freeze on immigration.
No long-range missiles, North Korea military parade features floats and flowers
Kim will meet with South Korean President Moon Jae-in the coming weeks to discuss a path toward denuclearization. This year's celebrations also mark the revival of North Korea's iconic mass games after a five-year hiatus.
'I'm very sorry': Nadal's classy words for shattered Thiem
The world number one worked his way back into the match but he was never in control and Thiem served for the third set. But once again Nadal stepped up the level, saved two break points in the game and then went on to claw back to 4-4.
After the interview, Pence said he had misunderstood the question and asked if he could clarify his answer.
"He was, nobody knows who the hell he is, or she, they put he, but that's probably a little disguise, that means it's she", Trump said.
This combination of file photos created September 4, 2018 show Associate Editor of the Washington Post Bob Woodward (L) speaking at the Newseum during an event marking the 40th anniversary of Watergate at the Newseum in Washington, DC June 13, 2012; and US President Donald Trump speaking during an event to announce a grant for drug-free communities support program, in the Roosevelt Room of the White House in Washington, DC, on August 29, 2018.
Trump has said the Justice Department should investigate and unmask the anonymous author.
"I went back through my emails and some of the documents that came out of the vice president's office, and I have to tell you, this op-ed is very similar to the style and communication that comes out of his shop."
In interviews Sunday, Pence and Conway denied a claim in the Times op-ed that alleged "there were early whispers within the cabinet of invoking the 25th Amendment" against Trump. The book "Fear: Trump in the White House" will be in stores this week, but excerpts have been widely reported.
He also derided National Football League ratings, blaming "take a knee" protests; hailed the state of the economy; defended his trade tariffs; and cited Fox News, his favorite outlet, as saying North Korea is committed to full denuclearization.