KABUL, Afghanistan (AP) — A massive audit of Afghanistan’s disputed presidential election won’t be done until Sept. 10, the U.N. said Thursday, quashing hopes the new president would be determined before an upcoming NATO summit.

The U.N. has been helping supervise an audit of eight million ballots to see who will succeed President Hamid Karzai, with the goal that the new president would be inaugurated by the end of August. But the audit has become increasingly contentious, which has slowed down the process.