Mayo Liberal candidate Georgina Downer's political views are "dangerously right-wing", independent MP Bob Katter says.
Hitting the campaign trail with fellow crossbencher Rebekha Sharkie, Mr Katter said Ms Downer felt a sense of entitlement to the seat held by her father, Alexander Downer, for more than 20 years.
"This lady comes out of extreme right-wing politics, dangerously right-wing sort of areas," he told reporters.
Ms Sharkie won Mayo from the Liberals in 2016 but was forced to resign this month over the citizenship saga.
She's now bidding to be voted in again and will face off against Ms Downer, who returned to SA recently from Victoria to win Liberal party preselection.
Joined by Mr Katter, Ms Sharkie headed for Yankalilla, south of Adelaide, on Wednesday ahead of an announcement in coming days for the date of the Mayo poll.
She said since being elected in 2016 she had forged strong relationships with other crossbench MPs including Cathy McGowan, Andrew Wilkie and Mr Katter.
"We have different views and don't always vote along the same lines but what we do share is a passion for our local communities, the tenacity to fight for the people we represent and a deep respect for each other as independent political voices," she said.
"I have enormous respect for Bob.
"We have worked together on issues such as protecting the reputation of Australian beef, putting Australian jobs first and stopping overseas countries from profiting from fake Aboriginal art."
During a question and answer session at the Yankalilla Men's Shed Ms Sharkie again apologised to voters for sending them back to the polls because of her citizenship issues.