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The three men all deny the charges against them
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Three former Labour MPs will learn later whether they will face criminal trials over their expenses claims.
David Chaytor, Elliot Morley and Jim Devine, who deny theft by false accounting, say Parliament, not the courts, should hear their case.
A Crown Court judge and the Court of Appeal have already ruled they are not protected by Parliamentary privilege.
The ex-MPs have taken their case to the UK's highest court - the Supreme Court - which will make a ruling later.
Former Bury North MP Mr Chaytor, 61, of Todmorden, West Yorkshire; former Scunthorpe MP Mr Morley, 58, of Winterton, north Lincolnshire; and former Livingston MP Devine, 57, of Bathgate, West Lothian, are all due to face separate trials at Southwark Crown Court.
At the Supreme Court in October, Nigel Pleming QC, representing two of the men, told a panel of nine judges their case was not an "attempt to take them above or outside the law".
He argued that the allegations made against the three must be "dealt with by the correct law, the law of Parliament" and said the expenses scheme was created and was administered by Parliament for Parliamentarians: "The administration of the scheme is also entirely a matter for the House of Commons - this extends not only to its creation but to its regulation and enforcement."
Prosecutor Lord Pannick QC argued that parliamentary privilege or immunity from criminal prosecution had never attached to criminal activities by Members of Parliament.
In July the Lord Chief Justice, Lord Judge, heading a panel of three Court of Appeal judges upheld a ruling by a judge at Southwark Crown Court in central London that the three were not protected by privilege.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.

The three men all deny the charges against them Related stories
Three former Labour MPs will learn later whether they will face criminal trials over their expenses claims.
David Chaytor, Elliot Morley and Jim Devine, who deny theft by false accounting, say Parliament, not the courts, should hear their case.
A Crown Court judge and the Court of Appeal have already ruled they are not protected by Parliamentary privilege.
The ex-MPs have taken their case to the UK's highest court - the Supreme Court - which will make a ruling later.
Former Bury North MP Mr Chaytor, 61, of Todmorden, West Yorkshire; former Scunthorpe MP Mr Morley, 58, of Winterton, north Lincolnshire; and former Livingston MP Devine, 57, of Bathgate, West Lothian, are all due to face separate trials at Southwark Crown Court.
At the Supreme Court in October, Nigel Pleming QC, representing two of the men, told a panel of nine judges their case was not an "attempt to take them above or outside the law".
He argued that the allegations made against the three must be "dealt with by the correct law, the law of Parliament" and said the expenses scheme was created and was administered by Parliament for Parliamentarians: "The administration of the scheme is also entirely a matter for the House of Commons - this extends not only to its creation but to its regulation and enforcement."
Prosecutor Lord Pannick QC argued that parliamentary privilege or immunity from criminal prosecution had never attached to criminal activities by Members of Parliament.
In July the Lord Chief Justice, Lord Judge, heading a panel of three Court of Appeal judges upheld a ruling by a judge at Southwark Crown Court in central London that the three were not protected by privilege.
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.

