Leading Islam critic Ayaan Hirsi Ali has likened the burka to wearing "a very big Swastika" in an exclusive interview with Seven News.

One day after the controversial Muslim women's rights activist cancelled her Australian tour over security fears, Hirsi Ali also compared the face covering to making a statement similar to those who fly the "ISIS flag".

"The burka that covers the face and that is really very much in your face, the kind of thing that stands out in the mall, that is just like the ISIS flag," she told Seven reporter Bryan Seymour on Tuesday.

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