Tanzania's main opposition, CHADEMA, plans to challenge a ban blocking the party from the upcoming October general elections. Observers say the ban could derail the country on its democratic journey.

Tanzania's main opposition party CHADEMA said on Tuesday its disqualification from elections due later this year was unconstitutional, days after its leader was arrested and charged with treason.

Tanzania’s main opposition party faces exclusion from general elections set for October after its leader was charged with ...