"I am deeply saddened to learn about the passing away of your husband, Shri Sis Ram Ola who was a friend and colleague of long years.... In his death, the nation has lost an eminent leader and social worker who was always in touch with the grassroots of society," Mukherjee said in his condolence message to Ola's wife.
"I am deeply saddened at the passing away of Sis Ram Ola, a popular political leader who was intimately connected to the masses," Ansari said.
He said in a long and distinguished public life spanning over five decades, Ola served the people of the country and his home state of Rajasthan with dedication and distinction.
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The Prime Minister also expressed grief at the demise of the 86-year-old Congress leader, who had been suffering from various ailments.
"He was a valued colleague and a dedicated social worker," the PMO said on social networking site Twitter.
The Union Cabinet, of which Ola was a member since June 17, this year, met at the Prime Minister's residence to mourn his death and passed a condolence resolution. It placed on record its appreciation for his services and deep sense of grief and loss at his demise, besides extending condolences to members of his family.