PHNOM PENH, Cambodia (AP) — Cambodia's long-ruling Prime Minister Hun Sen and the head of main opposition party are holding their first face-to-face meeting in years in a bid to find a way out of the country's current political stalemate over a disputed election.

The opposition says it would have won had the vote been fair and has threatened to boycott parliament's first session Sept. 23 unless an independent committee investigates its claims of widespread voting irregularities.

The government has rejected the demands.

Saturday's meeting between Hun Sen and opposition leader Sam Rainsy was called by King Norodom Sihamoni, and is being held at the Royal Palace in the capital, Phnom Penh.

Sam Rainsy's party made major gains in the July vote from previous elections, although the ruling party retained a majority of legislative seats.