Former Cognizant Chief Legal Officer Steven Schwartz and former Cognizant President Gordon Coburn are battling with prosecutors over whether a federal judge should admit evidence that the executives claim would help prove they are innocent of the bribery allegations they face.

The fight broke out in U.S. District Court for the District of New Jersey in recent weeks as the parties prepare for a May trial. It’s the latest twist in the drama-filled case. The trial was to occur last October but was delayed because the government was unable to persuade Indian officials to allow its key witness, Srimanikadan Ramamoorthy, the former Cognizant vice president of administration, to travel to the United States.