Alberto Santofimio was arrested last year in connection with the death of Luis Carlos Galan, who was killed during an election rally.
The former minister is accused of ordering a hitman associated with notorious drug lord Pablo Escobar to kill Galan.
Santofimio said Tuesday during the trial's opening statements that the charges against him were absurd, and asked that former Colombian leaders including presidents testify on his behalf.
Ray Liotta sues skin care company over use of likeness
Millions of Getty images now available for free via embed tool