Julian Assange's lawyers say they have been barred from seeing him at the Ecuadorian embassy in London.

Assange has living in the embassy since 2012 when he was accused of sexual assault by two women in Sweden.

The Australian denied their claims but refused to travel to Sweden to face them, because he claimed it was part of a ruse to extradite him to the US.

Julian Assange has been living in the Ecuadorian embassy in London since 2012. He is pictured speakin on the balcony of Ecuadorian embassy on May 19, 2017

Assange, pictured speaking at the balcony of the Ecuadorian embassy denied sexual assault claims but refused to travel to Sweden to face them. It was revealed this month the US has placed secret charges on Assange

Assange's lawyers, Aitor Martinez and Jen Robinson have been refused entry to the embassy this weekend, WikiLeaks tweeted.

Assange, 47, faces a US court hearing on Tuesday and needs to meet with his legal team to prepare, WikiLeaks reported.

Ecuador removed a UK ambassador who had been negotiating Assange's fate at its London embassy this week - sparking fears the country is preparing to boot Assange out of the embassy and hand him over to police.

'The hearing is on Tuesday in the national security court complex at Alexandria, Virginia,' WikiLeaks tweeted, adding it is to 'remove the secrecy order on the US charges against him.'

A US court document leaked in November finally revealed the US has already placed secret charges on Assange.

Ecuador's President Lenin Moreno is now said to have terminated the credentials of his British ambassador, Carlos Abad Ortiz, according to a decree published by WikiLeaks on Wednesday.

Julian Assange's lawyers say they have been barred from seeing him at the Ecuadorian embassy. It comes amid fears the embassy are going to kick him out and hand him over to authorities

Assange has recently been allowed access to visitors again after seven months of being cut off from both the outside world, Russia Today reported.

Ecuador announced it was restoring Assange's communications in October, but this came with conditions restricting his communications and placing visitors under greater scrutiny.

A US court document leaked in November finally revealed the US has already placed secret charges on Assange.

One of Assange's lawyers said the WikiLeaks founder will not willingly travel to the United States to face charges filed under seal against him.

Assange, who has taken cover in the Ecuadorian Embassy in London, where he has been granted asylum, has speculated publicly for years that the Justice Department had brought secret criminal charges against him for revealing highly sensitive government information on his website.