"I will not be judged by my people for my inaction ... even though my actions may be seen as intrusive, I want to know in my heart that I tried. The leadership of Te Kauhanganui and Te Arataura has been reckless and shameful."
He called for Ms Martin and Te Arataura to stand down and is openly backing Tuku Morgan, who failed to win re-election earlier this year to the board.
The parliament is due to meet this Sunday.
The former truck driver also had words for his followers about their attitudes towards him.
"Many of you ... have all made judgements of me, my decisions, my behaviour, my words, my appearance, my children, my wife, my office and my staff.
"I have continued to try to correct and improve myself regardless of your criticisms."
In the tribe's post-settlement era there has never been such a direct dressing down of the leadership tier by either the king or his late mother Te Arikinui Dame Te Atairangikaahu.
Ms Martin did not return calls.