Deputy Prime Minister Nick Clegg told the BBC Radio 4 World at One Programme: "I think it is very important people hold off making their judgement until they see the proposals.
"There has been a lot of speculation, some of it inaccurate, over the last couple of days. I happen to think it is right to have a debate about what we do as a society as criminals exploit new technologies.
"People should be reassured were are not going to ram something through Parliament. All along we will be guided by some very simple principles."
Liberal Democrat president Tim Farron vows the party would "kill" proposals for increased monitoring of emails and internet use.
Ministers are preparing a major expansion of powers to monitor the email exchanges and website visits of every person in the UK.