Australia's online safety regulator, Julie Inman Grant, has been labelled a "zealot" and called to testify before US Congress, over concerns her office has censored the internet for Americans.

The eSafety Commissioner received a letter from US Congressional committee chairman Jim Jordan on Tuesday, which took aim at Ms Inman Grant individually as well as Australia's Online Safety Act (OSA), describing it as a "foreign censorship regime".

"As a primary enforcer of Australia's OSA and noted zealot for global take-downs, you are uniquely positioned to provide information about the law's free speech implications,"

the letter stated.

"Your expansive interpretation of [the OSA]… directly threatens American speech," it said.

Ms Inman Grant has been asked to appear before the Committee on the

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