A Washington-based lobbying firm retained by Nigerian opposition figure Atiku Abubakar has filed a $57 million lawsuit in a U.S. federal court against President Bola Tinubu, the Nigerian government, envoy Femi Fani-Kayode and U.S. consultancy DCI Group, alleging defamation and a conspiracy to kidnap and harm its founder, the firm said. support@paulkizitoblog.compaulkizitoblog.com