‘We’ve been dehumanised’: how the US immigration debate became so toxic - video

With border crossings reaching record highs in recent years, US immigration has returned as the election's most toxic issue. As Donald Trump continues to push a policy of mass deportation, and Kamala Harris responds by shifting further to the right, what happens to the people caught in the middle trying to seek a better life? The Guardian's Oliver Laughland and Tom Silverstone head to Arizona's southern border with Mexico to investigate