The Constitutional Council on Wednesday upheld a National Election Committee rejection of an opposition party demand for a new round of voting.
The Sam Rainsy Party had requested another vote, claiming July's election had been illegitimate. The NEC rejected the claim earlier this month, on grounds that the irregularities reported were not supported by evidence.
The Sam Rainsy Party claims that the use of administrative form 1018 in lieu of identification, the omission of voters' names from registries, and other irregularities should be grounds for another election.
The Council hearing Wednesday was the last chance for an appeal, and the last hearing over Sam Rainsy Party election complaints.
The Council will examine complaints from the Human Rights Party Thursday.