But the UGTT union, which has more than 1 million members, says it will allow its members the freedom to vote as they choose on the constitution proposed by President Kais Saied.
The country is under pressure from the IMF to freeze salaries for public employees to help reduce its budget deficit.
Street protests draw thousands as huge UGTT union stages one-day nationwide strike to challenge government's refusal to raise salaries of some 670,000 public servants.
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