The royal commission into banking and financial services in Australia will begin to take evidence on Tuesday.

The build-up has been significant, with a range of scandals and issues across the big banks.

One man who has been a sharp critic of the banks through all of this is Nationals Senator John Williams.

“I think no doubt at all Ross, there will be some new evidence come forward about bank behaviour,” he tells Ross Greenwood.

Listen to the full interview below