The other aspects of the 670-page bill Mr Chauvel identifies as objectionable are:
* The requirement that the defence disclose to the prosecution issues in dispute before a trial starts.
* An apparent expansion of situations in which the court may proceed with a case in the absence of the defendant.
* Enhanced powers to award costs against the defence, and against defence lawyers in criminal matters.
Mr Chauvel said that even if Mr Power found a negotiated solution to the bill with the Act Party, he hoped he would consider talking to other parties too, especially about changes to the Bill of Rights Act.
He said the real objection over the jury threshhold issue was that it was a Bill of Rights issue and there had been no consultation across Parliament.
"The whole purpose of negotiating is to have a look at the evidence and work out what is reasonable rather than just have this diktat handed down by the minister."
A spokesman for Mr Power said the letter had been received but the minister was at the finance summit in Auckland yesterday and had not yet seen it.