The incident took place at Salbari in Chirang district Wednesday night, police said, adding that Bikramsingh Brahma was handed over to police by the woman's husband and the villagers Thursday morning.
"Local people caught hold of Brahma in the house of the victim and handed him over to the police. The villagers also beat up the politician before handing him over. The victim's husband filed a complaint against Brahma, alleging that Brahma had raped his wife," said Inspector General of Police (Law and Order) S.N. Singh.
"Brahma is in police custody now and he would be arrested soon. The police are waiting for the case to be registered," said Singh.
Brahma is the coordinator of the Congress party for the four districts of BTAD -- Kokrajhar, Baksa, Chirang and Udalguri -- and he had also contested the 2011 Assam assembly polls from Chapaguri constituency on a Congress ticket.
"It seems that Brahma had been taking advantage of the woman for quite sometime by giving her hopes that he would make her beneficiary of various government schemes," the IGP said.
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Meanwhile, Congress spokesman Haren Das said that strong disciplinary action will be taken against Brahma if the allegations against him were found to be true.
"Brahma has also been temporarily suspended from the party after the incident," said Das.