Kris Humphries' attorneys will issue a subpoena for Kim Kardashian's boyfriend, Kanye West.
The move comes after Kardashian's legal team formally subpoenaed Humphries' ex-girlfriend, Myla Sinanaj, to talk about her relationship with the NBA player.
A source told RadarOnline: "The gloves are clearly off now. Kris' lawyer, Lee Hutton, has no choice but to depose Kim's new boyfriend, Kanye West. Kim has publicly said that she and Kanye have been friends for years, and Kris' lawyers want to know if the two were ever intimate before they went public with their relationship a few months ago.
"Kris has no reason to believe that Kim was unfaithful to him during their very short marriage. Of particular interest to Team Humphries is Kanye's involvement in the Kardashian reality shows as he appeared on an episode of 'Kourtney & Kim Take New York'.
The insider added: "Kris lawyers will delve into if Kanye's appearance on the show, and what his involvement in the shows are going forward. Kris believes that Kim felt tremendous pressure to get married to him on camera, and this goes to the heart of his claim that the marriage is fraudulent."
Kardashian and Humphries' upcoming depositions won't be filmed.
The reality star's deposition will take place in Los Angeles at her lawyer Laura Wasser's office, while Humphries' will be conducted in Minnesota, and both are scheduled to take place in the next several weeks.
Once the depositions take place a trial will likely be scheduled for later this year.