29 November 2011 Last updated at 15:47 GMT
Vital Kamerhe helped run Joseph Kabila’s campaign in 2006One of the main opposition candidates in the Democratic Republic of Congo’s election says it should be cancelled because of fraud and violence.
Vital Kamerhe says the rigging was on a large scale and “deliberately planned” with pre-marked ballot papers.
He was a close ally of President Joseph Kabila before the pair fell out in 2009.
Many voters were unable to cast their ballots on Monday and so polling was extended until Tuesday in some areas.
However, the BBC’s Christophe Pons visited one such polling station in the capital, Kinshasa, and found that voting had still not taken place by Tuesday lunchtime.
Angry residents told him that there were 1,300 registered voters but only 100 ballot papers had been received.
Mr Kamerhe’s aides also accused the UN peacekeeping mission in DR Congo of showing bias towards Mr Kabila.
Over the weekend, Etienne Tshisekedi, seen as the strongest challenger to Mr Kabila, made similar accusations.