Go Forward candidate Amama Mbabazi has also joined FDC’s Kizza Besigye in rejecting presidential elections results.
Mbabazi, the former Prime Minister, came third with 1.4% in the total of the tallied votes.
Besigye was second with 35.5%.
Both candidates together with FDC president Mugisha Muntu are now under house arrest.
In a post-election statement, Mbabazi explains how things went wrong.