The defeated presidential candidate in Uganda's says he will challenge the official results in court within the next 10 days.
Kizza Besigye insists that he got more votes than President Yoweri Museveni.
He says the results were manipulated and many of his supporters were prevented from casting their ballots.
EU observers have not confirmed these complaints but did criticise Dr Besigye's arrest and incarceration after he announced he would stand.
Officials from the ruling National Resistance Movement have accused Dr Besigye and his supporters of being "bad losers".
'Harassment'
Mr Museveni accused his defeated opponent of failing to understand democracy.
He told the BBC that Dr Besigye's plan to challenge the result in court was "neither here nor there".
On Tuesday, Dr Besigye said the law gave him 10 days to lodge his legal challenge and his lawyers would meet that deadline.
"The main thrust of the petition is that our supporters were disenfranchised, the falsification of results - of which we have a lot of evidence - and bribery," he said.
"There are many polling stations where our agents were evicted, therefore we could not get the result forms."
On Saturday, he said that his party's figures showed he had 49% of the vote, against 47% for Mr Museveni, reports the AP news agency.
Official results show the president got 59%, to 37% for his opponent.
Dr Besigye also denied reports that his supporters might cause trouble, saying these were "meant to prepare the ground for further intimidation, harassment and arrest of our supporters and leaders".
"We are committed to working through legal and constitutional means to achieve the desired changes in this country."
He is facing trial for treason after being accused of links to rebel groups - charges he denies.
UK and US diplomats have urged Dr Besigye's supporters to avoid violence.
On Saturday, police used tear gas and water cannon to disperse his supporters as they protested against the results.
Test
In the parliamentary elections at least 80 MPs lost their seats, including 17 ministers, the Uganda media reports, but Mr Museveni's National Resistance Movement will still have a huge majority.
New faces in the next parliament will include First Lady Janet Museveni.
Uganda's first multi-party vote in 25 years was seen as a test of its democratic credentials.
Chief EU observer Max van den Berg recommended Uganda should reinstate a law limiting a president to two terms.
He also said state-media was biased towards Mr Museveni.
Mr Museveni changed the constitution to allow him to contest these polls.
(BBC)
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