Registrar of Political Parties Lucy Ndung'u has confirmed that the Party of National Unity (PNU) was dissolved on Friday to join Jubilee Party.
Ms Ndung'u said yesterday her office received the merger instruments signed by the party's chairman, John Kamaman and Organising Secretary Alphonse Musyoki.
"PNU held its National Delegates Convention on Friday morning and dissolved to join Jubilee Party. I have the merger instrument signed by PNU officials," said Ndung'u.
But PNU Secretary General John Okemwa has insisted that the party, associated with retired President Mwai Kibaki, had not dissolved to join the new outfit to be used by President Uhuru Kenyatta and his deputy William Ruto for re-election in 2017.
Mr Okemwa said proper procedure was not followed in convening the party's NDC so the process was illegal.
He said PNU would hold its delegates conference on October 28 to make a decision on the political path to take but maintained that joining Jubilee was not on the table.
The registrar advised the tussling factions to go to the Political Parties Tribunal to solve their differences.
"I have not received any complaint from any faction but they can go to the tribunal," she added.
She said 12 political parties, including PNU, had merged to form Jubilee Party.