But first, gabriel gatehouse reports from phoenix, where americas increasingly polarised political debate spilled out onto the streets. Voiceover bikers for trump. They came to phoenix, to show support for their president , and, they said, to stop protesters from harassing those who wanted to attend the rally. Charlottesville is still fresh in the memory. Two radically opposing visions for america clashed, blood was spilt, people died. We dont want to see anybody get hurt. The bikers condemned White Supremacists and neo nazis, and so, eventually, did donald trump, but he was slow and equivocal. Many saw in him a president who emboldened racist. For all of us to protect people from threats of violence by protesters. But america is in the grip of a cultural war so polarising, you might wonder whether these two sides lived on the same planet. Obama for the last eight yearshas emboldened people to come out and be violent because there has been no consequences for any of it, telling people