Labour backbencher John McDonnell urged ministers to review the possibility of incorporating a bank financial transaction tax within the bank levy.
But John McDonnell said that wasn't good enough - for him, there had to be "absolute solidarity" - "no ifs no buts".
Labour MP John McDonnell has presented a private members bill to make it possible, but without government support it is unlikely to succeed.
The Early Day Motion, tabled by Labour MP John McDonnell with cross-party support, urged the government to run the railway as a "public service".
Among the signatories are Conservative Zac Goldsmith, Labour MPs Mary Macleod, Seema Malhotra, John McDonnell and Andy Slaughter and Lib Dem peers Baroness Hamwee and Baroness Kramer.
BBC: Heathrow: Cross-party calls to speed up Davies Commission
The first MP to join Mr Livingstone's cabinet was John McDonnell - also a member of the Campaign group, and previously deputy leader of the Greater London Council.
Earlier on, Labour MP John McDonnell asked Mr Maude to confirm whether the pensions settlement would be "imposed" on the unions if agreement had not been reached by Christmas.
Labour's Dennis Skinner branded it a "disastrous day for democracy", while John McDonnell urged Mr Hunt to still refer the deal to the Competition Commission, because "nobody believes these undertakings agreed to by Murdoch will be adhered to in the long term".
It had all looked so promising on Monday for those who might want a contest when former minister Michael Meacher stepped aside and called on his supporters to back Campaign Group leader John McDonnell as the man to challenge Mr Brown for the leadership.
However, MPs rejected Labour MP John McDonnell's amendment to allow squatters to occupy a building if it had been empty for six months or more and if there were no significant steps being taken to "refurbish, let or sell the building at the time of the trespass".
Labour MP John McDonnell, parliamentary convenor of the Trade Union Co-ordinating Group, who also chairs the Right to Work campaign pointed out that the Unite trade union supports the Right to Work campaign financially and otherwise so rather than there being a divide between the two, there is a "coalition and an alliance".
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