Nafissatou Diallo Nafissatou Diallo

The hotel maid who accused Dominique Strauss-Kahn of sexual assault is speaking out for the first time because, she says, "I want justice."

"I want him to go to jail," Nafissatou Diallo told ABC's Robin Roberts. "I want him to know that there is some places you cannot use your money, you cannot use your power when you do something like this."

Diallo, 32, says Strauss-Kahn sexually assaulted her at a Midtown Manhattan hotel in May. At the time the International Monetary Fund chief, he was arrested and charged. Earlier this month he was released from house arrest after Manhattan District Attorney Cyrus Vance Jr. said he had concerns about Diallo's credibility.

"God is my witness. I'm telling the truth. From my heart. God knows that. And he knows that," the Guinean immigrant told Roberts.

Check out more of today's news

Diallo depicted the May 14 encounter with Strauss-Kahn, who was considered the front-runner for the French presidency: "I turned my head. He comes to me and grab my breasts. I said, 'Stop! Stop! I don't want to lose my job."

Strauss-Kahn's lawyers called Diallo's interview an "unseemly circus," adding: "Its obvious purpose is to inflame public opinion against a defendant in a pending criminal case."

Watch a clip from the interview, airing Tuesday at 11:35/10:35c on Nightline: