He made the request while speaking to the media after attending the House sessions.
Rajapaksa said the present government would last only two more Vesak Poya Days.
The JO will support if a SLFP MP is appointed the prime minister, he said, adding that he was not prepared to support UNP ministers.
Going by the present conduct of the president, a change in the premiership is unlikely, he said.
A written request to the speaker
Meanwhile, JO leader Dinesh Gunawardena told ‘Mawbima’ that the JO has been playing the role of the real opposition amidst various disruptions.
Once given that responsibility, the JO will strongly play the role of the opposition leader, said Gunawardena.
He said he would ask speaker Karu Jayasuriya in writing to give the opposition leader position to the JO if the UNP forms its own government.