Argentina's supreme court has effectively banned former president Cristina Fernandez de Kirchner from government, a move that poses both a challenge and an opportunity for the opposition Peronist party ahead of crunch midterm elections this year.

Argentina’s Supreme Court has upheld a six-year prison sentence on corruption charges for former President Cristina Fernandez de Kirchner.

In the short-term, the decision may enable libertarian President Javier Milei to cement his power base in the October midterm vote, but over the long run it could help revamp the Peronist movement, w...