Nas has filed a response for Kelis's request for divorce and has asked the court to deny the singer any sort of spousal support.
The claim was filed in Los Angeles court on Wednesday.
Kelis filed for divorce last month, claiming irreconcilable differences.
Kelis is pregnant with the couple's first child. She is due in July.
Both parents seek joint custody of the unborn child.
Nas and Kelis were married in 2003, but didn't go public until 2005, according to People magazine.