Mr Corbyn wrote on Twitter: 'The extradition of Julian Assange to the US for exposing evidence of atrocities in Iraq and Afghanistan should be opposed by the British government.'
It came after his Shadow Home Secretary, Diane Abbott, defended Assange as a whistleblower who had been 'exposing wrongdoing'.
Earlier Miss Abbott had told the Commons that there should be 'protection afforded to those who take personal risk to disclose wrongdoing where that disclosure serves the public interest' and the US request to extradite Assange should be refused.
Barrister Jennifer Robinson and Kristinn Hrafnsson, editor in chief of Wikileaks talk to the media outside the Westminster Magistrates Court after WikiLeaks founder Julian Assange was arrested today
Shadow home secretary Diane Abbott, pictured, told the House of Commons today Julian Assange was only being pursued by the US for 'exposing wrongdoing'
She is likely to be Labour's home secretary and thus in charge of such decisions if Mr Corbyn ever becomes prime minister.
Miss Abbott told the Commons: 'It this whistleblowing activity into illegal wars, mass murder, murder of civilians and corruption on a grand scale that has put Julian Assange in the crosshairs of the US administration.
He had become a target of the authorities because he had 'exposed wrongdoing by US administrations and their military forces', she said.
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