Federal Treasurer Scott Morrison has taken aim at welfare rorters — including reported cases of polygamy by Muslims to take advantage of spousal benefits — saying cracking down is a priority for the government, seven days ahead of the release of the midyear budget update.

Speaking on Sydney radio this morning, Mr Morrison said while the government is sometimes outmanoeuvred by some welfare cheats, measures that have yet to be approved by parliament could add billions to the budget's bottom line.

"Sometimes the crooks move quicker than the welfare cops on these things," he told 2GB Radio.

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