The Liberal Democrats have pledged to make sure legislation implementing the Leveson press regulation plan is drawn up "in good faith" in a further escalation of coalition tensions.
A spokesman for Deputy Prime Minister Nick Clegg dismissed Tory suggestions that a Bill was only being drafted to demonstrate the proposals were unworkable.
"The statement that this Bill is being drafted to show that it will not work does not reflect the position agreed by all three party leaders in the talks on Thursday," he said.
"And the Liberal Democrats in Government will ensure that the Bill is drafted in good faith.
"We owe that to the public and the victims."