New South Wales Deputy Premier John Barilaro is claiming "a great victory for the party" in the critical Upper Hunter election.

Nationals candidate Dave Layzell is on track to claim a resounding victory and a swing to the party, despite scandals within the Coalition.

Clinton Maynard spoke to Nine News State Political Reporter live from Singleton.

She's explained how the results unfolded and what it means for the leadership of both Gladys Berejiklian and Jodi McKay.

Click play below to listen to the interview.

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