Former Rep. Liz Cheney (R-WY) called President Joe Biden's withdrawal from Afghanistan "the biggest mistake" the U.S. has made since the attacks of Sept. 11, 2001.

During a Sunday interview on CNN, host Jake Tapper asked Cheney "what lessons we've learned" that could help Israel in its war with Hamas.

"Well, look, I think probably the biggest mistake that we made post-9/11 was President Biden's decision to withdraw from Afghanistan the way that he did," Cheney said. "I think the biggest lesson that we've learned, and frankly, after 9/11, the fact that the steps we took for over 20 years now have prevented another mass casualty terrorist attack at the hands of Islamic terrorists, is something that we all ought to be very clear about and we ought to remember."

"The lesson that we've learned and the lesson that we need to apply here is, first of all, these conflicts are connected," she added.

Cheney's father, Dick Cheney, was vice president when the U.S. went to war with Iraq, even though it was mainly unconnected to the 9/11 attacks.