Gary McKinnon's local MP says that the Home Secretary will have "blood on her hands" if she approves his extradition to the USA.
David Burrowes, the MP for Enfield South, has also threatened to resign from his position as a ministerial aide to the Environment Secretary if the extradition goes ahead.
Click here to watch a clip of him talking to ITV Daybreak.
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The rail union have slammed the move saying China is set to make "a killing at the British taxpayers' expense".
The meeting was arranged in the wake of Wednesday's terrorist murder of four people in Westminster.
Dozens of women gathered on Westminster Bridge to form a human chain in a show of solidarity with the victims of Wednesday's terror attack.