Opposition chief Raila Odinga has skipped the NASA summit.
The summit which is ongoing in Athi River, Machakos county was convened to discuss a number of arising issues in the coalition.
Raila has instead opted to send Siaya Senator James Orengo.
Top of the agenda is the Friday meeting between President Uhuru Kenyatta and Raila where NASA co-principals claimed that they only heard of the meet through media outlets.
According to ANC leader Musalia Mudavadi, the meeting was between two individuals and did not represent NASA interests.
Speaking on Sunday, Musalia said that the meeting might be a prank to impressive US Secretary of State Rex Tillerson who was visiting.
On Friday, Uhuru and Raila stated that they had buried the hatchet.
The two rivals said that it was time to unite the country.