A political commentator say regardless of whether the rumoured letter gathering signatures to oust David Shearer exists, a serious challenge for the Labour Party leadership is underway.
Chris Trotter says the move against Mr Shearer is very real and what's happening right now is the striking of backroom deals and gathering of numbers.
"These are destabilising rumours and this will just continue, this is the constant pressure now building against the leader.
"And if you look back at past coups, you see this process unfolding."
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