He wants action to help people who do not earn enough to make Social Security contributions.
These are set at currently £633 a month.
Anyone who earns below that figure is therefore not entitled to sick pay and may lose their pension rights.
Deputy Southern says that the rule is particularly tough on single mothers who work on minimum wage and want to work only part-time to look after their children.
He has worked out that a person earning the minimum wage would have to work more than 30 hours to meet the social security threshold.