Chile is holding presidential and legislative elections on Sunday November 19. Based in the south of the country, the indigenous Mapuche - literally "people of the land" - have been fighting with the Chilean state to reclaim their lands for the past two centuries. Today, there are between 600,000 and one million members of these descendents of pre-Columbian civilizations. With election day looming, their fate is high on the political agenda. Our correspondents report. Also, the investigation into the Trump campaign's alleged collusion with Russia turned up a notch this week, targeting US Attorney General Jeff Sessions. He's now blaming his memory for failing to mention, during a previous hearing, that he did witness Trump aides discussing Russia. This comes as the Russia allegations also pinpointed President Trump's son. This week, Donald Junior released a series of private messages he exchanged with WikiLeaks during and after the 2016 race.

And our number of the week is 18. There are 18 percent more homeless people in California, Oregon and Washington than there were just two years ago. American voters in those western states have approved more than eight billion dollars in spending to try to tackle homelessness. But the numbers of people without shelter or living in makeshift dwellings such as their cars continue to rise - we find out why.