Earlier this year, Amber Rose revealed that Kanye West stepped outside of their relationship and slept with Kim Kardashian. Now Kris Humphries wants to probe the timing of Kim and Kanye's tryst, as it might contradict Kim's alleged timeline about when she became romantically involved with 'Ye.

Although Kris' legal counsel has yet to speak directly with Amber, they have issued a subpoena and hope she will cooperate in their investigation. This could be a pivotal moment in the divorce proceedings, because if Amber does indeed provide pertinent information, Humphries could be sitting on some damning evidence against Kardashian.

He may have won the battle, but will Kris Humphries win the war?

[Radar]