Ms Harman said the payout was "money for nothing" and vowed that the ex-Royal Bank of Scotland chief executive would not end up with the cash even if his retirement deal proved legally watertight.
Sir Fred, blamed for leading RBS to near collapse and a taxpayer bail-out, has resisted demands that he give up the lucrative package which he insists was approved by ministers.
But Ms Harman, Labour's deputy leader, said that all necessary steps would be taken if the 50 year old would not do the "honourable" thing.
"Sir Fred should not be counting on being £650,000 a year better off as a result of this because it is not going to happen," she told BBC1's Andrew Marr show.
"The Prime Minister has said it is not acceptable and therefore it will not be accepted. It might be enforceable in a court of law this contract but it's not enforceable in the court of public opinion and that's where the Government steps in."
Ms Harman declined to say exactly what action could be taken but reports this week have suggested a special Act of Parliament was being considered by Downing Street as a last resort.
"The Prime Minister has asked him to forego it and obviously we want him to do that - that's the most straightforward and honourable way to do it.
"It is being crawled over by the lawyers to see whether it is actually an enforceable legal contract.
"So I don't want to jump ahead of it but I do want to be clear that the Prime Minister has been quite emphatic about this that he regards it as unacceptable."
She said the payout was a reward for failure
Sir Fred, blamed for leading RBS to near collapse and a taxpayer bail-out, has resisted demands that he give up the lucrative package which he insists was approved by ministers.
But Ms Harman, Labour's deputy leader, said that all necessary steps would be taken if the 50 year old would not do the "honourable" thing.
"Sir Fred should not be counting on being £650,000 a year better off as a result of this because it is not going to happen," she told BBC1's Andrew Marr show.
"The Prime Minister has said it is not acceptable and therefore it will not be accepted. It might be enforceable in a court of law this contract but it's not enforceable in the court of public opinion and that's where the Government steps in."
Ms Harman declined to say exactly what action could be taken but reports this week have suggested a special Act of Parliament was being considered by Downing Street as a last resort.
"The Prime Minister has asked him to forego it and obviously we want him to do that - that's the most straightforward and honourable way to do it.
"It is being crawled over by the lawyers to see whether it is actually an enforceable legal contract.
"So I don't want to jump ahead of it but I do want to be clear that the Prime Minister has been quite emphatic about this that he regards it as unacceptable."
She said the payout was a reward for failure
a special Act of Parliament was being considered by Downing Street as a last resort.I'm sure the Human Rights lawyers will have a field day!
I wonder if this will all quietly fade away and be forgotten about once the next storm brews up
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