The Serious Fraud Office (SFO) has been urged to reopen its inquiry into a £43bn BAE arms deal with Saudi Arabia.
Liberal Democrat leader Nick Clegg said the investigation, which was suspended in 2006, must be allowed to continue.
The High Court ruled that the SFO acted unlawfully by dropping the corruption inquiry into the al-Yamamah deal. BAE maintains it acted lawfully.
BBC News political correspondent James Hardy said it remained possible that the High Court would tell the SFO to reactivate the inquiry.
On Thursday judges said the decision to halt the inquiry represented an "abject surrender" to pressure from a foreign government.
Lord Justice Moses said that the SFO and the government had given into "blatant threats" that Saudi co-operation in the fight against terror would end unless the probe into corruption was halted.
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