Volunteers use computer as they input data of vote tally forms, of this month's election, in a room at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. In a low-rise Jakarta office block, young Indonesian supporters of President Joko Widodo sit hunched over screens to count photographed vote tallies from polling stations, two weeks after an election to lead the world's third-biggest democracy. REUTERS/Willy Kurniawan

Volunteers use computer as they input data of vote tally forms, of this month's election, in a room at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. Opposing campaigns have set up their own operations, dubbed "war rooms", to verify counts after Widodo's challenger, Prabowo Subianto, disputed unofficial tallies by private pollsters giving the president a lead of about 10 points. REUTERS/Willy Kurniawan

A volunteer gestures as he input data of vote tally forms of this month's election in a room at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. Retired general Prabowo has said his poll put him on 62 percent and alleged widespread cheating, raising the prospect of a legal challenge when official results are released next month, and the risk of street protests. REUTERS/Willy Kurniawan

A volunteer looks to the monitor as she inputs data of vote tally forms, of this month's election, in a room at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. In 2014, Prabowo also claimed victory, before contesting the results at the Constitutional Court, which confirmed Widodo's win. This time, social media has been awash with conspiracy theories, questioning the neutrality of the election commission and election supervisory agency. REUTERS/Willy Kurniawan

A volunteer receives a head massage during a break as he uploads details of vote tally forms, of this month's election, in a room at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. Counting is done manually in Indonesia and results are filled in on a tabulated form posted at polling stations with "official witnesses", including from parties, taking photographs of the so-called form. REUTERS/Willy Kurniawan

A volunteer looks to a monitor as he checks the quick count result of this month election at Joko Widodo's national campaign team office in Jakarta, Indonesia, April 29, 2019. Picture taken April 29, 2019. In a low-rise Jakarta office block, young Indonesian supporters of President Joko Widodo sit hunched over screens to count photographed vote tallies from polling stations, two weeks after an election to lead the world's third-biggest democracy. REUTERS/Willy Kurniawan