Pennsylvania's new controversial voting law

A law backed by Republicans in Pennsylvania will add a new requirement for voters in the upcoming US presidential election - a photo ID with an expiry date.

Opponents of the new law say it could prevent hundreds of thousands of people from voting; primarily the elderly, minorities and the poor because they are less likely to have the necessary paperwork or the means to get an id. They are also more likely to vote Democrat.

Al Jazeera's Kristen Saloomey reports