Chad's constitutional council confirmed Mahamat Idriss Deby as winner of the May 6 presidential election on Thursday after dismissing challenges by two losing candidates - cementing a victory that extended his family's decades-long rule. Deby, who seized power the day rebels killed his father, President Idriss Deby, in 2021 and declared himself interim leader, won 61% of the vote, well ahead of second-placed candidate Succes Masra with 18.54%, the council said.