Immigration Minister Peter Dutton has backed comments by Prime Minister Tony Abbott that "heads should roll" at the ABC after it rebroadcast Monday's episode of Q&A that featured a former terror suspect.

Mr Dutton told reporters in Canberra on Friday that the government's escalating attack on the national broadcaster was entirely appropriate after Q&A allowed Zaky Mallah into the audience to ask junior minister Steven Ciobo a question on the government's proposed citizenship laws.

"I endorse the words of the Prime Minister that heads should roll because it was an inappropriate use of taxpayers' money," Mr Dutton said.

"Q&A clearly have lost the plot and something needs to happen and it needs to happen quickly."