With allegations of sexual misconduct spanning five decades from more than 50 women, it was only this past week that a Pennsylvania judge ruled that there is enough evidence to try Bill Cosby on criminal charges. Elizabeth Vargas brings the latest news in "Cosby on Trial" - a legal battleground that now includes both civil and criminal actions across several jurisdictions - including Cosby's new defamation counterclaims against some of his accusers.

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