Second lady Usha Vance spoke with her husband, Vice President JD Vance, about how Charlie Kirks' death influenced their decision to have a fourth child.

Vice President JD Vance's wife Usha revealed that conservative activist Charlie Kirk's assassination last year ultimately influenced their family's decision to have a fourth child.

Vance and his wife appeared on "CBS News Sunday Morning" to discuss Vance's upcoming book "Communion: Finding My Way Back to Faith." In Vance's book, he described sitting with Kirk's wife Erika on the day of Kirk's assassination in September, where she told Usha "between sobs" that she "regretted having only two kids with Charlie."

Vance wrote that, although they had discussed having another child before, "something changed" for both himself and Usha after Kirk's death.

ERIKA KIRK REFLECTS ON LIFE, LOSS AND FAITH IN FIRST TV INTERVIEW SINCE CHARLIE KIRK’S DEATH

Vice President JD Vance wrote in his book that Erika Kirk, Charlie Kirk's widow, described how she "regretted" having only two children with her husband. (Jonathan Ernst/POOL/AFP via Getty Images)

"I think it really heightened JD's sense that he'd been talking about this for a while, this sense that there was this possibility of having another kid whom he could love as much as the three that we had," Usha said.

She continued, "It really did crystallize for [him], that sense that if you could have that other child, then you would have nothing to regret. And if we couldn't have that other child, then we were very happy with the children that we had. So it was very powerful what she said about her own family and certainly very moving to both of us."

The Vances announced Usha's pregnancy in a statement shared on social media back in January. The couple said that the baby is a boy and that he is due in July.

JD VANCE RELEASING BOOK ABOUT FAITH JOURNEY, CONVERSION TO CATHOLICISM

U.S. Vice President JD Vance and his family, including wife Usha Vance, announced in January that they were expecting a fourth child. (Kenny Holston/Pool via Reuters)

JD and Usha Vance are also the parents to Ewan, Vivek and Mirabel.

During the interview, Usha emphasized that while Kirk's death wasn't the decisive factor for having a fourth child, the assassination occurred as she was considering the possibility.

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"I think I had already started to open my mind to the possibility. I wouldn’t say this was for me in any way the decisive factor, but it came in the middle of a conversation that we were already having," Usha said.

Vance's book is set to release on June 16. In an interview with "Jesse Watters Primetime," Vance described the book as detailing his "long and winding road" to find faith in God after feeling he "lost it" as a young man.

JD Vance and his wife Usha appeared on "CBS News Sunday Morning" to discuss Vance's upcoming book on faith. (Reuters)

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Fox News' Maria Lencki contributed to this report.

Lindsay Kornick is an associate editor for Fox News Digital. Story tips can be sent to lindsay.kornick@fox.com and on Twitter: @lmkornick.

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