Venezuela was previously suspended in December for failing to uphold commitments it made when it joined the group in 2012.
The new suspension will make it harder to return to good standing since it can be lifted only when the bloc is satisfied that Venezuela has restored democratic order.
The decision came at a meeting of Mercosur foreign ministers in Sao Paulo today, as Venezuela's newly formed constitutional assembly ousted the country's chief prosecutor who broke with President Nicolas Maduro in April.
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