(FILES) This file photo taken on August 10, 2016 in Lusaka shows Zambian Ruling party Patriotic Front presidential candidate and incumbent Zambian President Edward Lungu looking on during his presidential campaign closing rally. Zambia's newly re-elected President Edgar Lungu faces an uphill battle to revive an economy reeling from a slump in copper prices, with a free-falling currency and widening budget deficit. / AFP PHOTO / GIANLUIGI GUERCIAGIANLUIGI GUERCIA/AFP/Getty Images