Watch: Kim Kardashian Says Caitlyn Jenner is 'Not a Good Person' & a 'Liar' Over Book

In a preview clip for the upcoming episode of "Keeping Up with the Kardashians" Sunday, Kim Kardashian West calls Caitlyn Jenner a "liar" after reading a passage from the transgender activist's book.

Kim and her two sisters Khloe and Kourtney sit together as she reads a passage from Caitlyn's book, "The Secrets of My Life." In the excerpt, Caitlyn claims the women's late father, Attorney Robert Kardashian Sr., believe his friend and client O.J. Simpson was guilty of murder during the infamous Simpson trial in the '90s.

"Robert Kardashian knew O.J. Simpson was guilty but joined the defense team to get back at his remarried ex," Kim reads. "Robert told Caitlyn in secret, after the O.J. trial that he believed his friend was guilty."

"That's not true..." Khloe responds.

"Dad so believed in him," Kim adds.

"Like, to sell a book, you're going to make something up?" Kourtney says.

Kim then says: "It is so shady that Caitlyn came over and gave me the book and then on the phone she said, 'The final version has a few more things in it but don't worry, it's nothing about you.'

"So she lied to me, because it is about me if it's about our dad," Kim adds.

"My relationship with Caitlyn was strained, but I was trying to be respectful," she adds before being cut off by Khloe, who says:

"You're very - you have the most patience."

"Yeah, but if you talk about my dad, I will cut you," Kim says.

Back with her sisters, Kim says she's always "had Caitlyn's back" but says she is "a liar" and "not a good person."

Watch the intense clip below.

[H/T Page Six]

This story is part of our special report: "PopUps". Want to read more? Here's the full list.