Indonesia's incumbent presidential candidate Joko Widodo gestures as he speaks during a campaign rally at Gelora Bung Karno stadium in Jakarta, April 13, 2019. Thousands of people and mass of political party supporting Jokowi - Ma'ruf crowd the Gelora Bung Karno (GBK) Stadium. REUTERS/Willy Kurniawan

Indonesia's incumbent presidential candidate Joko Widodo gestures as he speaks during a campaign rally at Gelora Bung Karno stadium in Jakarta, April 13, 2019. ANTARA

Indonesia's incumbent presidential candidate Joko Widodo speaks during a campaign rally at Gelora Bung Karno stadium in Jakarta, April 13, 2019. REUTERS/Willy Kurniawan

Indonesia's incumbent presidential candidate Joko Widodo gestures as he greets his supporters during a campaign rally at Gelora Bung Karno stadium in Jakarta, April 13, 2019. REUTERS/Willy Kurniawan

Indonesia's President Joko Widodo addresses supporters at a rally at Gelora Bung Karno Stadium in Jakarta, April 13, 2019. REUTERS/Edgar Su

Indonesia's incumbent presidential candidate Joko Widodo with Ma'ruf Amin and Jusuf Kalla speaks during a campaign rally at Gelora Bung Karno stadium in Jakarta, April 13, 2019. ANTARA