WikiLeaks editor-in-chief Kristinn Hrafnsson said “extensive spying” had been carried out against Mr Assange, who has been in the London embassy since 2012. Mr Hrafnsson told reporters at a press conference WikiLeaks believed security had monitored the group founder’s every move and meeting since arriving in the embassy. He added that the data had been given to the Trump administration.
Last week, WikiLeaks announced that Mr Assange was due to be expelled from the embassy “within hours to days” according to a “high-level source”.
However, the Ecuadorian Foreign Ministry later denied the reports, calling it “false news”.
Mr Hrafnsson said: “The new and unexpected thing that came to light is WikiLeaks uncovered extensive spying against Julian Assange in the Ecuadorian embassy.
“It is a total invasion of privacy of Mr Assange.
“And what we have established is security has monitored his every move and every meeting with visitors.”
He added: “We also know there was a request to hand over visit logs and video recordings from within the embassy.
“We believe this has been handed over to the Trump administration.”
The comment sparked huge international interest, with hundreds of Mr Assange’s supporters going to the embassy to protest.
The fugitive programmer has been in the embassy for seven years after seeking asylum there as Swedish police wanted to question him over allegations of sexual assault and rape.
Swedish prosecutors dropped the arrest warrant and rape investigation in May 2017, but British police said Mr Assange would still be arrested if he tries to leave the embassy.
The reason for this is that a British warrant was issued after he failed to surrender for his extradition.
Mr Assange denies the Swedish allegations and claims they are politically linked to his whistle-blowing website which released classified US documents.
WikiLeaks’ first big scoop came in April 2010, when it released a video showing a 2007 US helicopter attack in Iraq that killed several unarmed civilians, including two Reuters journalist.