NSW Treasurer Matt Kean and opposition Daniel Mookhey have gone head to head in a debate.

Matt Kean brought up an issue from a previous Royal Commission in 2014.

Mr Mookhey was a Trade Union official at the time.

The interim report noted: “More than $100,000 was owed to Jeffries Printing Services for the 2012 HSU election campaign.”

Ben revealed the bill wasn’t paid until 26 August 2014.

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