NASA has even threatened to boycott the elections if the electoral agency does not pull out of the contract with the company.
Chebukati noted the commission has signed contracts and the work is going on, "so we really have no reason to change."
He said the ballot papers will be in the country a few days or at least a week before the election.
"But remember we are printing 120 million ballot papers. Printing is not the big part...the big part is packaging them and ensuring they are delivered to polling stations, no mistakes are made and that security features are maintained," he said.
"That is the issue we are looking at and that is why we need time. We don't have time because [the schedule] needs to be followed up to the letter."
The chairman said the Opposition can pull out because they can easily find other people to participate in the election.
"There are many Kenyans. There are other stakeholders - civil society, religious leaders and the media. They can be agents...we shall invite those willing to participate to come with us to oversee to ensure the process is fair."
The Commission invited stakeholders to accompany and monitor the production of the ballot papers.
The stakeholder monitoring delegation was to include a representative of each of the eight presidential candidates and one from the civil society.
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