It has been revealed that letters from former minister Denis MacShane admitting expenses abuses cannot be used to prosecute him because they are protected by Commons rules.
Officials said parliamentary privilege meant the key correspondence was withheld from police when they launched a probe into the MP two years ago.
And the documents are still not legally admissible - even though they were published in a Commons sleaze report today.
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Peter Whittle has said it was probably too early for Paul Nuttall to run as an MP for the party after only just becoming its leader.
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