Ford Kenya leader Moses Wetang'ula and his deputy Boni Khalwale now claim that Amani National Congress leader Musalia Mudavadi is a Jubilee project.
The two claimed Mr Mudavadi was being used by the Government to weaken the Opposition.
They also alleged that the recent endorsement of Mudavadi as the Luhya spokesman would not add votes to the Opposition but only bring confusion.
The senators claimed Mudavadi was working for the good of the Jubilee team due to his association with Central Organisation of Trade Unions Secretary General Francis Atwoli.
"If Mudavadi is seriously interested in teaming up with CORD, he should focus on the agenda and forget about associating himself with Atwoli, who is engaged in political business," said Mr Wetang'ula.
Mudavadi was installed as the Luhya spokesman on the eve of the New Year following a survey by University of Nairobi on the most preferred candidate from western Kenya.
The study was commissioned by Mr Atwoli.
And yesterday, Dr Khalwale sensationally claimed that immediately after Mudavadi's crowning as the community spokesman, Atwoli travelled to Mombasa to meet President Uhuru Kenyatta.
He also alleged that Mudavadi's ally and Lugari MP Ayub Savula was spotted with Deputy President William Ruto's aide Farouk Kibet after the ceremony.
"Mudavadi wants to be used by Jubilee. If he wants to survive, he should stop associating himself with Atwoli and Savula," said Khalwale.
But Mudavadi, through his spokesman Kibisu Kabatesi, said his new position did not allow him to engage in shouting matches with Wetang'ula and his team.
"Mudavadi has taken his endorsement seriously and is interested in unifying the community rather than engaging in shouting matches with any leaders," said Mr Kabatesi.
He said Mudavadi was currently consulting on how the community could advance in national politics.
Wetang'ula and Khalwale where addressing their supporters in Lugari.