A hero to admirers who say he has exposed abuses of power, Wikileaks founder Julian Assange is cast by critics as a dangerous enemy of the state who has undermined Western security.
Assange appeared by videolink from prison as lawyers discussed the management of his hearing next week to decide whether he should be extradited to the United States.
A CIA spokeswoman declined to comment.
The request was reportedly made last Thursday, but only became known to the public on Monday.
Assange is being held in the high-security Belmarsh prison "as if he were convicted for a serious criminal offense."
"Julian Assange, 47, has today, Thursday 11 April, been arrested by officers from the Metropolitan Police Service (MPS) at the Embassy of Ecuador," police said.
In a statement, Ecuador's foreign ministry denied it had reached an agreement with the British government to jail Assange if he left the embassy.
That investigation was later dropped, but Assange fears he could be extradited to face charges in the United States, where federal prosecutors are investigating WikiLeaks.
President Lenin Moreno of Ecuador told radio stations on Tuesday that Assange has "repeatedly violated" the terms of his asylum.
Manning's communications team released a statement saying the judge said she will be detained until she either cooperates or the grand jury finishes its term.