Sagar had joined the Congress on May 12, 1972, and was elected as an MLA in 2002.
He is a former minister and was considered a close associate of former deputy chief minister Mangat Ram Sharma.
Welcoming Sagar in the party, Abdullah said the National Conference is the only and natural destination for all those who believe in single entity and a pluralistic identity of Jammu and Kashmir.
"Sagar and his associates were the source of strength and they will be valued like the cadre of National Conference in steering out the state from prevailing morass," the former chief minister said.
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"Instead of getting job letters, the educated youth feel lured to take guns in their hands, as they find their future bleak," he said.
Referring to the recent suicide attacks on a CRPF camp in Pulwama and IED attack in Sopore, he said the rise in violence marks the failure of the PDP-BJP coalition government.
"The PDP-BJP (government) has produced more militants than ever before," he said.
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