George Galloway has rejected claims he lied under oath to the US Senate committee which accused him of receiving oil cash from Saddam Hussein.
The Respect MP ridiculed the senators' claims during a hearing in May.
Now they say fresh evidence links him and his estranged wife to Iraq's oil-for-food programme. Mr Galloway and his wife both deny the allegations.
Mr Galloway said: "I am ready to fly to the US today... to face such a charge (perjury) because it is simply false."
The US Senate committee claims to have found £85,000 in Iraqi oil money in the bank account of his estranged wife Dr Armineh Abu-Zayyad.
The MP could face criminal charges if he is found to have given false testimony to the committee on 17 May.
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