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One of the lawyers for Assange, who is in a UK jail, told Euronews his client had been "weakened by detention conditions which are absolutely extraordinary".
WikiLeaks founder Julian Assange appeared in a London court on Monday for a hearing on whether he should be extradited to the United States to face spying charges.
"No matter what happens today ... whether i'm placed in confinement or not, I'm not going to comply with this grand jury," Manning said.
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Following the arrest of the WikiLeaks founder, Trump distanced himself from a group whose work attacking Hillary Clinton he frequently cited during his first campaign.
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Assange has been holed up inside Ecuador's London embassy since 2012.