An unprecedented ticking off by the Prime Minister.
Speaker Trevor Mallard last night claimed a staffer committed sexual assault - speaking under parliamentary privilege.
He previously apologised for falsely accusing the same worker of rape.
Jacinda Ardern says it's disappointing and that Mallard did not meet her standards.
Former United Future leader Peter Dunne told Heather du Plessis-Allan he's never seen a Prime Minister rebuke a Speaker.
"The Prime Minister has gone as close as she can by giving him his marching orders.
"She can't fire him, but by saying she has got serious concerns about his conduct, that is a clear signal of a lack of confidence."