Confirming the move, the leaders appointed by the coalition to spearhead the process led by economist and NASA strategist David Ndii, said they have suspended the People's Assembly in support of the unity process initiated by President Uhuru Kenyatta and Raila Odinga.
ANC Secretary-General Barrack Muluka said the decision by Mr Odinga to close ranks with Mr Kenyatta was not a surprise "as that has been his style of politics, and Nasa must now come to terms with the fact that it has lost one of its kingpins to Jubilee".
But Mr Odinga defended his move, saying it was the best option given the challenges facing the Opposition in recent days.
"He felt that talking directly to the President was the most practical thing to do, given the circumstances", said a source, who described the meeting as initially "tense" and devoid of the pleasantries that have characterised previous Nasa get-togethers.
The NASA principals revealed that they would raise the issue with Odinga at today's meeting. "All the three care about is 2022 just because of an agreement that bars Mr Odinga from contesting the presidency".
In the election aftermath, about 150 people were killed and Mr Odinga subsequently swore himself in as the "people's president" and refused to recognise election victor, Mr Kenyatta, as head of state.
Working with Jubilee, he added, would in fact be beneficial to Nasa.
During an ODM national governing council meeting early this month, the party told its allies in the coalition that it was ready to go it alone if pushed.
Mr Odinga, it is also understood, has been uneasy with the opposition's isolation by the West, which has denied him and his colleagues leverage to push their much-touted electoral and judicial reforms.
Uhuru Kenyatta and Raila Odinga spoke on national TV on Friday March 9 2018 after holding their first public meeting since the poll.
In a press address, Mr. Ndii hailed President Kenyatta and Mr. Odinga for acknowledging that the country was facing a unity crisis hence the need to commence a healing process.