Congolese businessman and opposition leader Moïse Katumbi on Monday launched his bid for the central African nation's presidency.Katumbi is challenging left-wing incumbent President Felix Tshisekedi, who in 2018 succeeded his long-ruling predecessor, Joseph Kabila.Katumbi attacked Tshisekedi over his handling of affairs in the country's conflict-ravaged east, where M23 rebels and other groups have made international