"We noticed that he was bothering in the election and we do not allow it because we have principles, very clear values, because we would not want anyone to disturb us in the election," he said. "We will not allow it to happen to a foreign country and a friend like the United States."
Correa granted asylum 2012 to Assange, who took refuge in the country's London embassy to avoid extradition to Sweden about allegations of sexual abuse, which he denies. Correa pushed its power to anti-US vitriol and adapted to Assange after WikiLeaks published highly-rated Pentagon material.
The report quoted hundreds of surveillance documents describing Assange's time in the embassy. The documents describe how Assange met Russians and world-class hackers at critical moments and acquired powerful new computer and network hardware to facilitate data transfers just a few weeks before WikiLeaks received hacked material from Russian operators.
"The WikiLeaks motivation was that they provided truthful information," Correa told CNN. "Certainly, but it was only about Hillary Clinton. Not about (Donald) Trump. So, they didn't say the whole truth. And not to say that all truths are called manipulation. And we won't allow that.
WikiLeaks didn't answer on several requests for comments regarding exclusive CNN reporting. Assange lawyers refused to comment.
In the interview on Tuesday morning, Correa from Assange abstained, even though he constantly defended his decision to grant Wikileaks founder in 2012.
" You know how many times I've talked to Assange? Never. "I don't know him," said Correa. "Once he interviewed me when he worked for Russia today, via Skype."
Correa was president of Ecuador from 2007 to 2017 and named himself a leading American antagonist in Latin America, in the form of late Venezuelan dictator Hugo Chavez.
"I'm far closer to Hillary Clinton than Trump," Correa told CNN. "I know Hillary, I admire her. I was a US student who did a PhD when Bill Clinton was (president). Trump is an enemy to our immigrants. Why the hell will we support him? Know."
But in the interview, Correa did not indicate that the US repetition broke that decision and he personally refused to receive a warning from US officials about Assange before the 2016 election.
The former Ecuadorian leader also said it was "nonsense" that Assange was "the boss of the embassy" and played out Assange's influence. The monitoring reports obtained by CNN described in detail how Assange's power competed with that of the Ambassador and Assange using his relations with senior officials in Ecuador to threaten diplomats and guards at the London Embassy.
CNN's Patricia Ramos contributed to this story.