He said the JD(U) took the decision after considering all aspects and the election for the top office should not be a matter of confrontation.
Kumar said his party had always taken independent decisions, including backing the candidature of Pranab Mukherjee, who was then the UPA's nominee, for the post while being in the NDA.
"There is no doubt about the result. We have a lot of respect for 'Bihar ki beti'. But the question is has the 'Bihar ki beti' been chosen as the opposition candidate, but she will lose," he told reporters here.
The Bihar chief minister said, "There should be a strategy for the 2019 general elections. This is not for victory in 2019."
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He said that Kovind's name was announced first by the ruling party and the JD(U) did not have any objection to his name.
"That is why we supported him," Kumar said.
The JD(U) had yesterday rejected its ally and RJD chief Lalu Prasad's request to reconsider its support to the NDA's presidential pick, saying its stand was based on merit and it would stick it.
He said he had met Congress president Sonia Gandhi and CPI(M) leader Sitaram Yechury and that he had conveyed to them that it was a matter of pride that Bihar Governor Kovind will become the next president.
Kovind had worked for Bihar without any bias, Kumar said.
"It's an election for the post of the president. It should not become an issue of confrontation," he asserted.
He said the president's chair was not for a political battle.
"Had there been a consensus, it would have been a good thing, but I do not consider it should be a matter for raising questions," Kumar said.
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