Why is Trudeau allowing Saudi preachers to proselytize to non-muslims in Canadian prisons?

According to this article in the Saudi Gazette – Saudi preachers make 21,500 prison visits abroad last year – Saudi preachers made some 40 visits to Canadian prisons last year to present “the beauty of Islam to non-Muslim inmates and invite them to the religion. The preachers answered the prisoners’ queries on the religion and corrected many misconceptions about Muslims and Islam.”

Aside from oil Wahhabi Terrorism is Saudi Arabia’s biggest export so I find the claim they were combating extremism dubious at best.