The statement was sent to U.S. Secretary of State Rex Tillerson by Alan Lowenthal, Steve Chabot and Edward Royce.
Election observers and labor rights campaigners said without clear guidance many could be excluded from the results.
Sebastian Strangio recently wrote an article titled “Welcome to the Post-Human Rights World”.
A small number of the roughly 1 million Cambodian workers in Thailand who have managed to register to vote will be unable to cast a ballot if no assistance is forthcoming, they told the Hello VOA program on Thursday.
Sguon Samean is seen as “a courageous female commune chief” in Trapaing Chan commune, which is home to more than 6,000 villagers.
The Black Monday Campaign was created to advocate for the release of political prisoners in Cambodia.
The Overseas Press Club of Cambodia said in a statement that the move was “potentially dangerous and defamatory” and urged a retraction.
According to analysts, Hun Sen has not directly taken part in political campaigning since 1998.
According to the National Election Committee (NEC), some 8,000 disabled people have registered to vote.
The NDI is holding similar events in Takeo province’s Tropeang Thom Khang Cheung commune, on Wednesday, and Kratie province’s Svay Chreas commune, on Friday.
Thousands of district positions to be contested in June 4 ballots.
Depending on the source, 81.47 percent to 95 percent of Cambodia's 9.6 million eligible voters are registered.
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