Independent MP Bob Katter is facing calls to either apologise or resign and has been referred to the parliamentary standards tribunal for threatening to punch a Nine reporter.

Katter doubled down yesterday and claimed he should have been "more aggressive" following his threatening outburst at 9News journalist Josh Bavas last week during a press conference.

Parliamentarians have demanded Katter publicly apologise and the 80-year-old has been referred to the parliamentary standards tribunal by Greens Senator Sarah Hanson-Young.

Young today said she has written to Speaker of the House Milton Dick and the Independent Parliamentary Standards Commission (IPSC) to demand action.

The IPSC, which was launched last year, is an independent workplace investigation framework which enforces the

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