"The woman told us that Swami then asked her to meet him in Okhla area. When she reached there, he took the woman to a house in his car and raped her and threatened her not to reveal the incident to anybody," a police official said.
The woman, however, reported the incident to the police.
She was sent for medical examination which confirmed rape after which Swami was arrested, police said.
Swami joined AAP before Delhi assembly elections last year and had also sought a ticket from Okhla constituency.