Not possible Partypooper, otherwise the Law of the Jungle would apply. One would be free to make the most outlandish, innacurate, defamatory accusations.

Using another example, politicians have immunity from legal action being taken against them for what they say in Parliament. I believe the media is also permitted to accurately report what has been said in Parliament in the national interest.

However, it is quite common to hear a politician say to a member of the other side in a media debate or outside Parliament, "How about repeating your accusations here? Have the guts to say what you said in the House here."

Of course it is not repeated, because then legal action could be taken for defamation.