The Labour Party is calling for a tax on the sale of SUVs - based on weight.
Its leader Ivana Bacik says it would only apply to SUVs which use fossil fuels.
Motoring journalist, Geraldine Herbert, wants manufacturers to provide more variety - as people don't have much choice when buying a family car.
She says motorists already paying enough tax on their vehicles:
"We have a polluter pays motor tax system at the moment. If you have a car that emits more you pay more."
"We also pay a huge amount of tax on new cars so I think motorists are already heavily taxed."
"I do think there's an onus on consumer to think about their buying choices but car makers have to provide alternatives to SUVs, like people carriers to give people options."