Amani leader Musalia Mudavadi on Wednesday dismissed assertions that NASA will disintegrate before the August 8 polls.
He said the National Super Alliance is a people's movement, therefore, cannot be shaken by the exit of an individual.
"NASA is not built on personalities. Anyone seeking to go it alone will be the one to lose. Such a move will not break us," Mudavadi said.
The coalition brings together Mudavadi, Raila Odinga (ODM), Kalonzo Musyoka (Wiper) and Moses Wetang'ula (Ford-K).
In response to reports that Kalonzo may bolt out, Mudavadi said none of the four co-principals have plans of joining other parties.
There are claims of a rift among the four leaders and their allies over who should fly the coalition's presidential flag.
But the Amani leader, in a statement, said the idea belongs to Kenyans yearning for good leadership and it will not matter who delivers the same.
"NASA ticket is collective. We are united and none of the four co-principals can contemplate exiting," he said.
"Our interest is to deal with poor leadership as the root cause of tribalism, corruption, incompetence and nepotism," Mudavadi said.
He said that upon assuming office, they will put in place strong mechanisms to monitor use of public funds.
"We will carry out lifestyle audit of all civil servants, change safeguards on wealth declarations and improve access to information," he said.
Mudavadi urged Kenyans to vote for leaders who are trustworthy, honest and with high levels of integrity.