They were writing in the wake of the arrest and detention of Kem Sokha, the leader of the opposition Cambodia National Rescue Party (CNRP); the charge was treason.
Prime Minister Hun Sen, the strongman who has ruled Cambodia for more than three decades, has taken a strident anti-American line in an increasingly tense run-up to a 2018 election and a crackdown on critics, rights groups and independent media.
The United States Thursday demanded Cambodia reverse its ban on the country's main opposition as it warned the dissolution of the party would strip 2018 elections of legitimacy.
"The government of Cambodia has taken a series of steps to weaken political opposition and undermine democratic institutions, human rights and freedom of expression", the MA delegation wrote to Tillerson.
Two days after the Supreme Court order, CNRP signs were removed from in the party headquarters in Phnom Penh and offices across the country on Saturday. Hun Sen has been fighting a deepening war of words with the USA embassy and State Department over his government's crackdown on the opposition.
The Cambodia Daily newspaper reported the two journalists were accused of setting up broadcasting equipment in the capital and sending news reports to Radio Free Asia's Washington bureau. Mahajan did not immediately reply to a Reuters request for comment on the charges.
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The request to dissolve the CNRP was filed by the Ministry of Interior on 6 October 2017 which claimed that the party had been plotting to overthrow the Government through a "colour revolution" with U.S. backing.
In a statement released on Friday, the 28-nation European Union said "an electoral process from which the main opposition party has been arbitrarily excluded is not legitimate".
Lowell has the largest population of Cambodians for a city along the East Coast. "This is not risky to the country", said the lawyer, Keo Vanny.
A spokesman for Hun Sen's ruling party said the country would be fine without American backing. They also urged Hun Sen to stop harassing and intimidating Cambodia's opposition.
"On current course next year's election will not be legitimate, free, or fair", the statement said.