Plot: America's guest worker program is coming under increasing scrutiny as Congress scrambles to find a solution to the country's immigration crisis and considers expanding the current program. But how is America treating guest workers who are already here? Are we welcoming temporary employees with open arms, or are they being exploited in ways that make employee rights groups cringe? This week on NOW we travel to the remote mountains of Montana and follow a number of guest workers, most of them from Mexico, to find out what life is really like on this side of the border