The head of a Tunisian opposition party said on Friday he had been summoned for investigation over a radio interview and accused President Kais Saied of attempting to intimidate opponents. Ghazi Chaouachi, the head of Attayar party and a prominent critic of Saied, said an investigative judge had called him to answer suspicions of “disturbing public order and disrupting the work of government”. Saied has entrenched one-man rule since seizing executive power last summer, dismissing the parliament and moving to rule by decree as he prepares to replace Tunisia’s democratic constitution, moves his …