Weinstein, 33, is a Russian immigrant leader and represented Yisrael Beytenu on the city council. She was Yisrael Beytenu leader Avigdor Liberman's chief of staff when he was foreign minister.
Weinstein was born in Russia and made aliyah at age six. She was raised in Holon.
"Naftali Bennett is good at finding solutions, and he really cares about people," Weinstein said. "Bennett is a real leader, and as an enthusiastic Zionist and right-winger, I see Yamina as my political home."
Bennett praised Weinstein as a woman who knows how to get things done and is sensitive to poor people, because she experienced poverty.
In the past, Weinstein was very critical of the religious establishment on social media. She is considered a secularist, whose views are very different on matters of religion and state than religious Zionist Sderot Mayor Alon Davidi, who joined Yamina on Sunday.