Ugandan presidential challenger calls arrest "shameful" Uganda's former prime minister Amama Mbabazi has called his arrest was "shameful", following his release Thursday evening. Police released two Ugandan presidential challengers after they were arrested for planning campaign rallies without permission. The opposition leaders, ex-prime minister Amama Mbabazi and Kizza Besigye, a leader of the Forum for Democratic Change (FDC) party, are both hoping to challenge veteran President Yoweri Museveni in elections next year. IMAGES AND SOUNDBITES.