Two Liberal politicians have defended a decision to allow former Breitbart editor-in-chief Raheem Kassam into the country, saying a push to ban him was part of a "disturbing recent trend" to clamp down on freedom of speech.

Labor has called on the Morrison government to deny Mr Kassam a visa after comments in which he called the Koran "fundamentally evil" and tweeted that Scottish National Party leader Nicola Sturgeon should have her legs taped shut "so she can't reproduce".

Raheem Kassam, right, in the company of US President Donald Trump and Nigel Farage. Credit:Twitter/@RaheemKassam

Mr Kassam, a former adviser to Brexit campaigner Nigel Farage, is scheduled to be in Australia next week for the first local Conservative Political Action Conference (CPAC), an export from the United States where it attracts tens of thousands of attendees.

Liberal politician Craig Kelly, who will speak alongside Mr Kassam at the conference, said Labor's push to ban him was part of a "disturbing recent trend of attempts to silence those that hold different political views".