Opposition leader Kem Sokha was arrested last week on treason charges that have been criticised by Western countries and are dismissed by his party.
Instead of attending a voting session on their arrested leader's immunity, Cambodian National Rescue Party will hold a protest in front of a prison where he is being put.
The Organisation for Security and Cooperation in Europe said there had been abuses in the election including vote-buying, putting pressure on public servants, and intimidating of voters to vote for certain parties.
Demonstrators demand Prime Minister Sorin Grindeanu and his cabinet step down after they attempted to pass a controversial decree to decriminalise corruption offences involving less than $48,000.
Opposition Labor Party says it will not support legislation to this effect. Conservative Prime Minister Malcolm Turnbull earlier announced a proposal to prevent genuine refugees from returning to the country under any circumstances.
Some 16 million Moroccans are eligible to vote, with 30 parties competing for seats. Turnout will be a key factor, after it reached only 45 percent in the November 2011 polls.
US and China, world's top greenhouse gas emission producers, pledge to formally adopt Paris climate deal by end of this year
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