Mr Begg told students “any right-minded person” would oppose the Prevent strategy and told audiences they should have sympathy for jihadists killed fighting with Al Nusra, the Syrian branch of al-Qaeda.
Jeremy Cobrbyn's close ally attended the event organised by the human rights organisation to call for the closure of the Guantanamo bay.
Cage organised the protest outside the American Embassy in Grosvenor Square this afternoon to mark the 14th anniversary of the opening of the prison in Cuba.
Mr McDonnell said: "I am chair of the All-Party Shaker Aamer Parliamentary Group and it is part of out campaign to ensure Obama upholds his promises to shut down Guantanamo.
"This will bring an end to the atrocities taking place there. The reason why it is important that it is shut down before Obama finishes his term is because if it isn't by then there is the fear that it may never will.
"The allegations include physical assault and sleep deprivation. I don't know how many detainees there are still in Guantanamo - you would have to ask Shaker."
Mr Aamer was released from the prison in October 2015 after being held without trail or charge for 14 years.
Cage said it was a "historical moment as this is the largest gathering of former detainees to protest the prison."
It will also be "an emotional first meeting for the men who have never before met to share their experiences of imprisonment at Guantanamo with Shaker."
In November the Director of the advocacy group said Jihad is an
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