Prosecutors in Ukraine are seeking to question former Trump campaign manager Paul Manafort surrounding a corruption probe in the country, CNN reports. The cable-news network reported that Ukrainian authorities have made “repeated requests” to American officials, including FBI Director James Comey. According to Ukraine officials, those calls—seven of which have been made over the past two years—have gone unanswered. Manafort has not been charged with a crime, and the investigation is focused on former Ukrainian Justice Minister Oleksandr Lavrynovych. Manafort declined to comment to CNN.