Australian Broadcasting Corporation Chairman Justin Milne has resigned amidst of allegations of political interference.

The crisis within Australia's national broadcaster began on Monday when Managing Director Michelle Guthrie was sacked.

Within 24 hours allegations against Justin Milne began to emerge amidst threats of legal action from Guthrie.

Criticisms of her term as Managing Director also began to emerge: Jon Faine's comments, Leadership lacking.

David Anderson, appointed as Acting MD, says staff were surprised by the news. Other media were all over the story, dissecting Guthrie's management term for reasons for her sacking.

By Wednesday allegations of political interference from the Chairman began to surface in relation to Emma Alberici, Andrew Probyn and the Triple J Hottest 100 date change.

On Wednesday ABC staff called for an Inquiry and for thne Chairman to step down during that Inquiry. Communications Minister Mitch Fifield initiated a departmental investigation into the matter.

The board met with Milne this morning and shortly after that meeting he resigned.