on the newshour tonight: e president trump visitthe southern border, wlook at the potential risks of shutting dowt access between u.s. and mexico. then, 25 years after the rwandan genocide, three survivors use photography to find reconciliation with the perpetrators of ss killings. >> your photography can help you ll your story to other people, and then they can learn about you. that can be a medicine. that can heal someone.dr >> wf: and, it's friday. mark shields and david brooksyz anthe president's threat to shut down the u.s. southern border, the last on the mueller report, and how joe biden is handling "personal space." all that and more, on tonight's pbs newshour. >> major funding for the pbsee newshour hasn provided by: ♪ ♪ moving our economy for 160 e enhat nn us. >> ordering takeout. >> finding the west route. >> talking for hours. >> planning for shers. >> you can do the things you like to do with a wireless plan designed for you. with talk, text and data. consumer cellular. learn more at consumercellular.tv >> babbel. a language program that teaches spanish,rench, italian,