Yassine Ayari, a 40-year-old former blogger, is serving a two-month sentence handed down in late 2018 for comments he posted about the army on Facebook.

His arrest came five days after Saied dismissed the prime minister and suspended parliament.

Ayari condemned the move on social media as a "military coup".

Saied has also declared a crackdown on corruption, accusing hundreds of businessmen of embezzlement.

Ayari, an independent MP, lost his parliamentary immunity that had kept him out of jail as a result of the president's decision.

The MP's lawyer Mokhtar Jemaai told AFP that Ayari, who suffers from an ulcer, started his hunger strike on Tuesday in protest at "civilians being subjected to military justice".

His incarceration, which has been widely condemned by rights groups, could be extended "as part of a settling of political scores", he said, adding Ayari could face further charges of harming the army's reputation.

Ayari's vocal criticism of authorities has brought him many run-ins with the law.

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