Shimon Peres has reportedly suffered stroke and is being attended to by a group of specialists battling to help him out.
The 93-year-old, who suffered a light heart attack in January, received a pacemaker last week.
Peres served as Prime Minister for eight months after the assassination of Premier Yitzhak Rabin in 1995 and for a brief term between 1984 and 1986, under a rotation agreement with Yitzhak Shamir.
He later was elected Israel’s ninth President between 2007 and 2014.
Widely respected abroad as a “warrior for peace,” he shared the 1994 Nobel Peace Prize with Rabin and Palestinian leader Yasser Arafat for signing the 1993 interim Oslo peace accords.