If this report is true, it's a change from earlier:
One of his defeated rivals also congratulated Mr Ahmadinejad. Mohsen Rezai, who won just 1.7% of the vote, declared that Mr Ahmadinejad had been elected president by "legal procedures". "I will support him in a bid to prevent any delays in the provision of services to the people," Mr Rezai said in a statement.
We should assume that the BBC report still holds, but keep the ABCNews tweet in our minds.