The relationship between Assange and his host country has grown increasingly fractious in recent times-despite the fact he has been granted Ecuadorean citizenship-and just two days ago, Moreno said that the Australian had "repeatedly violated" the terms of his asylum, in part, for meddling in political matters, Al Jazeera reported.
In the tweet it said: "A high level source within the Ecuadorian state has told that Julian Assange will be expelled within 'hours to days" using the offshore scandal as a pretext-and that it already has an agreement with the United Kingdom for his arrest'.
Julian Assange's cat Michi sits at the window of the Ecuadorian Embassy, 14-11-2016.
Assange has lived at the Ecuadorian embassy since 2012 to avoid extradition to Sweden, where he has been accused of sexual assault.
WikiLeaks in a statement called Mr Moreno's charges "completely bogus", saying it reported on the accusations of corruption against the president only after Ecuador's legislature investigated the issue.
In 2011, USA authorities opened a grand jury hearing to decide whether to prosecute Assange and WikiLeaks for the release of hundreds of thousands of government secrets, The Guardian reported.
After an global arrest warrant was issued by Swedish police through Interpol, Assange presented himself to the Metropolitan police in December 2010 and appeared at an extradition hearing where he was granted bail.More news: Eden Hazard takes a dig at Tottenham Hotspur after stadium inauguration
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"If President Moreno wants to illegally terminate a refugee publisher's asylum to cover up an offshore corruption scandal, history will not be kind", WikiLeaks said.
A top Ecuadorian official denied WikiLeaks' claim and said no decision had been taken to expel Assange.
In a speech to the Ecuadorian Broadcasting Association on Tuesday, Moreno accused the whistleblowing organisation of intercepting phone calls and private conversations and also complained about "photos of my bedroom, what I eat, and how my wife and daughters and friends dance".
He added: "Assange can not lie or, much less, hack into private accounts or private phones".
"But the bigger question still is whether the US Government will assert criminal charges against him and seek his extradition to the United States". Then in October, Assange filed suit against Ecuador after they decided to make him, among other things, clean his own bedroom and bathroom and pick up his cat's shits.
Last month, the Inter-American Commission on Human Rights, which is linked to the Organization of American States, rejected Assange's request that Ecuador ease the conditions it has imposed on his residence in the London embassy.