During his third day of being questioned in Brisbane Supreme Court, where he is defending a $4.8 million lawsuit, the talkback host stood by the assertion.

“I had plenty of eyewitness evidence,” he said. “I was a voice for the voiceless.”

Toowoomba-based Wagner brothers John, Denis, Neill and Joe are suing Jones, Harbour Radio, 4BC and writer Nick Cater over 32 broadcasts relating to the 2011 Queensland floods between 2014 and 2015.

They allege they were blamed for the deaths of 12 people in the town of Grantham during the 2011 floods, when one of the walls of the Lockyer Valley quarry they owned collapsed.

“I’ve regularly asserted that,” Jones said.

Under cross examination from the Wagner’s barrister Tom Blackburn, Jones was questioned about what had led him to form the view.

“You had no, first of all, hydrological evidence, at all,” he asked.

“No, I did not,” Jones replied.

“You had no scientific evidence, expert evidence, of any kind,” Mr Blackburn followed up.

“No, just the evidence of people’s eyes. Witnesses,” Jones responded.

On Friday, Jones denied that he hated the Wagners, was careless with the truth and wilfully blind to information that didn’t suit his narrative.

The talkback radio host was defiant last week throughout the often fiery cross-examination as he defended himself in the multimillion-dollar defamation lawsuit.

The Toowoomba-based Wagner brothers are seeking $4.8 million in damages.

Jones stood by his allegations the Wagners lied about the cause of the Grantham flood and the fact the quarry wall that collapsed was man-made.

On Friday, he admitted in court his broadcasts were savage, but denied he had a bitter hatred for the family and a desire to see them fail, although maintaining his accusation they could have bribed Qantas.

He said he’d raised his concerns about air space and the approvals process for the Wagners’ Wellcamp Airport in Toowoomba with Qantas chief executive Alan Joyce.

He said he was taken by surprise when he learned the airline was going to start flying into the airport and that a bribe had been paid was a “perfectly legitimate” conclusion.

Jones will continue giving evidence on Monday afternoon.