Nawinne, a UNP member of Parliament, had supported Rajapaksa during the political crisis last October.
However today he appeared at a media conference chaired by UNP Presidential candidate Sajith Premadasa and extended support for Premadasa.
Nawinne said that he was confident Premadasa will win the election.
He said that he left the UNP while maintaining his party membership owing to some concerns he had.
However he says he decided to extend support to Premadasa as he is a good leader and someone who should be President of the country.