His kicker was, "And I think I've wasted enough of my viewers' time".
Miller spent minutes denying the claim, raised in Michael Wolff's book "Fire and Fury", that Trump himself met with a Russian lawyer who claimed to have dirt on Democratic candidate Hillary Clinton - then Miller admitted that he as "no knowledge of anything to do with that meeting".
"I was a very excellent student, came out and made billions and billions of dollars, became one of the top businesspeople, went to television and for 10 years was a tremendous success as you probably have heard, ran for president one time and won", he said.
As Tapper tried to move on to specific questions, like the president's recent comments about Steve Bannon, Miller interrupted to praise Trump for everything that he accomplished in the 2016 election. Bannon referred to a 2016 meeting between Donald Trump Jr and a Russian Federation lawyer at Trump Tower as "treasonous" and suggested that it was highly likely that Trump Jr told his father about the meeting. "I'm trying to get to the point that Steve Bannon-" Tapper said, before Miller interrupted.
Members of the Trump administration and Republican lawmakers flooded the airwaves on Sunday to vouch for the president's intellectual bona fides and to attack Wolff.
Miller grew incensed and accused Tapper of being "condescending", and the two started talking over each other.
"That was a snide remark", he said.
As Miller continued to rattle on, Tapper provided details of upcoming segments before heading to commercial break.
When Tapper got to the president's mental fitness, Miller turned it into a full-on slap of CNN, saying there was a "crisis of legitimacy" and a "toxic environment" at the network.
'The president's tweets absolutely reaffirm the plainspoken truth: A self-made billionaire revolutionized reality TV and tapped into something magical that is happening in the hearts of this country, ' Miller said.
Miller followed up by bashing CNN even more, but Tapper had finally had enough.
"There is one viewer that you care about, right now".
During the contentious interview, Miller offered largely combative responses and focused on presenting Trump as a "political genius," repeatedly refusing to answer questions until Tapper chose to cut him off and move to the next segment.
"We talk about some of the most serious matters facing America and the world, complex issues, the president is engaged, he understands the complexity, he asks really hard questions of our team at CIA", Pompeo said on "Fox News Sunday".