Four months after losing the leadership spill he instigated, Peter Dutton has broken his silence in an extraordinary spray at Malcolm Turnbull.

Calling the deposed prime minister spiteful and indecisive, the Home Affairs Minister told Brisbane's The Sunday Mail that Mr Turnbull had brought about his own downfall through his lack of political nous.

"Malcolm had a plan to become Prime Minister but no plan to be Prime Minister," was Mr Dutton's damning evaluation.

He also criticised the former leader for actions he saw as undermining the Morrison government.