Kim Kardashian West will not tolerate anyone who comes after her famous family — which she proved when she responded in no uncertain terms to the rumors around Kylie Jenner’s reported pregnancy. In a new preview for season 14 of Keeping Up With the Kardashians, she takes on Caitlyn Jenner, whom she calls a “liar” and “not a good person.”

In the clip, the 36-year-old is chatting with her sisters, Kourtney and Khloé Kardashian, when the topic of Jenner’s memoir, The Secrets of My Life, comes up.

Though the book was unpublished at the time of the taping, Kardashian West apparently got an alert about one passage that references her late father. “It says in Caitlyn’s book, ‘Robert Kardashian knew O.J. Simpson was guilty, but joined the defense team to get back at his remarried ex. Robert told Caitlyn in secret after the O.J. murder trial that he believed his friend was guilty,'” she tells her sisters, reading from her phone.

Khloé immediately objects, saying, “That’s not true! Like, what?” And Kourtney adds, “Like, to sell a book, you’re gonna make something up?”

“Dad so believed in him,” Kardashian West says. “It is so shady that Caitlyn came over and gave me the book, and then on the phone she said, ‘Well, the final version has a few more things in it, but don’t worry, it’s nothing about you.’ So, she lied to me, ’cause that is about me, if it’s about our dad.”

Later, in a confessional, she admits that her relationship was Caitlyn was already “strained,” but that she was trying to be respectful. “But if you talk about my dad, I will cut you,” she says clearly. Yikes.

“I have always had Caitlyn’s back,” she tells her sisters. “But she is a liar. She is not a good person.”

You’ll be able to see the drama for yourself when the season premiere of Keeping Up With the Kardashians airs on E! on Sunday at 9pm ET/PT.

What do you think about Kim Kardashian West’s comments? Let us know @BritandCo.

(Photo via E! Entertainment/YouTube)