Ambassadors of Australia and the US criticise Duterte for saying he should have been first to rape the 'beautiful' missionary.
According to the elections department, there are 25,616 voters in the Bukit Batok single member constituency.
Republican presidential candidate Donald Trump and Democrat candidate Hillary Clinton scored victories over their rivals in New York.
Duterte had initially refused to offer apology, saying he will not say sorry for a mistake he did not commit.
The plan to hold elections on 2 July sets off a campaign that would last 74 days
Footage shows Duterte saying rape victim was so beautiful that he should have been the first to rape her.
Roussef faces a Senate trial on charges of manipulating budget accounts.
Few people notice the fact that nationalism and anti-nationalism do not have stable meanings
The latest revelation by the Saudi minister was scoffed at by opposition media in Malaysia.
A Xinhua article said neither muscle-flexing nor arbitrary intervention will shake China's resolve to safeguard its sovereignty and maritime right.
The US move could aggravate the Chinese resistance against any other country claiming parts of the territory.
The G7 foreign ministers' meeting held in Hiroshima on Monday is yet another move by 'outsiders' to fuel militarization of the region, according to Xinhua.
Currently, permissions have to be sought each time there is a US requirement.
The lower house will next decide on putting the president to trial.
As none has emerged with the necessary 50% vote share, there should be a run-off between the top two, which has now been slated to 5 June.