missal sent "a terrible signal" to the world about the organisation.Peter Galbraith said he believed he had been removed because of a dispute with his superior over how to handle fraud allegations in the country's elections.
He said that in not addressing the "extensive" evidence of fraud, the UN had failed its Afghan mandate.
The UN said his dismissal had been "in the best interest of the mission".
Mr Galbraith told BBC's World Tonight that he had great respect for UN Secretary General Ban Ki-moon, but that he disagreed with his decision to remove him from his post.
"Not just on personal ground, but because I think it sends a terrible signal when the UN removes an official because he was concerned about fraud in a UN-sponsored and funded election," he said.
Mr Galbraith said he had seen "very extensive evidence of fraud" in August's president elections and had had "a sharp disagreement" with his superior, Kai Eide, about how to address it.
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