A defiant Pauline Hanson has declared her party's performance at the weekend's WA election was "fantastic", and claimed her party will pick up as many as five upper house seats.

Senator Hanson blamed Labor for spooking voters about One Nation's now-infamous preference deal with Colin Barnett's Liberals, and said the "scare campaign" was "all I heard" at polling booths on Saturday.

"People were supportive and said they wanted to vote for us but said when they heard we were doing preference deals with [the Liberals], they could not vote for us," she told Sunrise on Monday morning. "That's what I heard."

Senator Hanson insisted the media was covering up the extent of the One Nation vote, saying her party had already picked up three seats, and "possibly another two".