Former Meru Governor Peter Munya has denounced his allegiance to the National Super Alliance (NASA) barely one week after joining the coalition.

In a letter seen by Pulselive.co.ke, Mr Munya, who is the PNU party leader,  mentioned that he will be supporting the re-election of President Uhuru Kenyatta in the upcoming poll.

"After thorough consultations with our party members, elders and supporters across the country, it has been agreed that in the very interest of the country we support the re-election of His Excellency President Uhuru Kenyatta in the forth-coming presidential election scheduled for the 17th October, 2017," the letter read in part.

Munya asked PNU supporters to campaign for President Kenyatta across the country.

He also promised to 'vigorously' campaign for the Head of State.

Here is the letter: