This news comes after Ecuadorian President Lenin Moreno said Mr Assange has "repeatedly violated" the conditions of his asylum at the country's embassy in London, where the WikiLeaks founder has lived for more than six years.
Mr Assange sought refuge there in 2012 to avoid extradition to Sweden, where he faced accusations of sexual assault that prosecutors in Stockholm have since abandoned.
In an interview broadcast by several Ecuadoran radio stations, Mr Moreno said: "Assange has too often repeatedly violated the agreement we have with him and his legal team," without saying whether Ecuador would withdraw asylum.
"It is not that he cannot speak freely, it is not that he cannot express himself freely, but he cannot lie, let alone hack into accounts or intercept private telephone calls" under the terms of his asylum agreement, Mr Moreno said.
Mr Assange has refused to leave the embassy to avoid extradition to the United States to face charges over his website publishing huge caches of hacked State Department and Pentagon files in 2010.
The Australian denies the rape claims, and said he feared Sweden would pass him on to US authorities if he was extradited.
The Swedish chief prosecutor dropped proceedings against him in 2017 because going ahead and serving notice of charges would necessitate Mr Assange's presence in court.
Mr Moreno's comments come after the Ecuadoran government filed a formal complaint to the UN special rapporteur on the right to privacy, Joseph Cannataci, accusing WikiLeaks of spreading private information linked to Mr Moreno.
Photos, videos and private conversations appeared on portals such as Twitter and Facebook.
Mr Moreno was also forced to deny allegations of corruption which surfaced on the website inapapers.org, with the president claiming he knew who was responsible for the accusations.
Relations between Mr Assange and his embassy hosts have been deteriorating for months.
In October, Mr Assange sued Ecuador for violating his "fundamental rights" by limiting his access to the outside world after his internet and mobile phone access were blocked back in March.
Quito accused him of breaking "a written commitment" not to interfere in Ecuador's foreign policies.
Mr Moreno reiterated Tuesday that the government continues "to seek a solution" to Assange's situation.