Liam Richards / THE CANADIAN PRESS

Leitch used the first Conservative leadership debate on Wednesday as an opportunity to reiterate her controversial proposal to screen all immigrants for "anti-Canadian values." At one point she held up a copy of Points of Entry, written by McMaster University sociology professor Victor Satzewich, saying it gave evidence of how weak current immigration standards are.

“Currently only one in ten immigrants to this country receive a face-to-face interview by a trained immigration officer," Leitch said on stage with 11 other leadership hopefuls. "The focus today seems to be on quotas. I’m concerned about that."

"And it’s all in this book, [by] a sociologist who’s interviewed many immigration officials," she said.