Tonight is the last chance the Presidential candidates have to make their case to the American people on the biggest stage. CNN Political Director David Chalian discusses what to expect from the final debate. Plus, a surprise federal government announcement that Russia and Iran have been meddling in the US election. And finally, former President Barack Obama’s scathing rebuke of his successor in his return to the campaign trail.To learn more about how CNN protects listener privacy, visit cnn.com/privacy