Former Israeli Prime Minister Ehud Barak put his support behind Zionist Union's Isaac Herzog on Monday, according to The Jerusalem Post.
In a statement, Barak, who also served as defense minister and Israeli army chief of staff, said that Herzog is a balanced, experienced and responsible person.
"I saw Isaac Herzog up close during the most sensitive of security and domestic hearings and in the end-- [made] decisions," he said.
"I support Isaac Herzog. Israeli civilians as well can trust him on every security matter that before us."
On Thursday, former president Shimon Peres also announced his endorsement of Herzog to be the next prime minister of Israel.