In today's episode of US Election Watch, Republican nominee Trump has claimed that voter fraud is happening in two Pennsylvania counties, even though officials are still investigating voter registration issues there. With just a week until Election Day, Trump and the Republican National Committee seem to be preparing to challenge the results if he loses. Trump raised concerns on social media about fraudulent registrations before waiting for the investigations in York and Lancaster counties, despite Pennsylvania's secretary of state asking for patience. NDTV's Allister D'Souza speaks with Professor of Political Science at Columbia University Robert Shapiro to discuss this and more