Liberal hopeful Dave Sharma has demanded the Coalition do more to tackle climate change, arguing Australia must put itself in a “credible” position to convince other countries of the merits of stronger international action.

In a major speech designed to separate himself from the Liberals ahead of a rematch against Kerryn Phelps in the seat of Wentworth in May, Mr Sharma will suggest his diplomatic skills could be useful in convincing US President Donald Trump to rejoin the Paris Agreement.

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