R&B singer Cassie is expected to return to the witness stand in her ex-boyfriend Sean “Diddy” Combs' sex trafficking trial. Prosecutors are asking the judge to force the cross-examination of Cassie to end Friday, over concerns she is nearing the birth of her third child. Prosecutors say there could be a mistrial if she's called back to testify Monday but goes into labor over the weekend. Defense lawyers claim prosecutors delayed calling Cassie to testify so that the defense would have less time to question her. Combs has pleaded not guilty to sex trafficking and other charges.