Defeated opposition leader Peter Dutton has laid significant blame for the Coalition’s election loss at the feet of Liberal MP Andrew Hastie in explosive secret submissions to the party’s election review that accuse Hastie of going “on strike” and fumbling key policies.

Hastie’s shock exit from leader Sussan Ley’s frontbench on Friday has fuelled speculation about her leadership as MPs return to Canberra this week, likely dulling the opposition’s attacks on the government on the Optus saga and the repatriation of so-called ISIS brides .

The West Australian’s social media musings on net zero by 2050 and migration have excited some colleagues but they have led others to question his strategic nous and his interest in keeping the party on the rails.

Dutton, who spent years alongside Ha

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