Replying to media queries on JD(U)'s reservations on some key political issues, Singh said, "It is a very old ally and if there are any issues then we will sit together and find a solution to it."
This is the first time that BJP has said it is open to negotiations with its ally JD(U). There is a growing chorus within BJP for making Modi the Prime Ministerial candidate, a proposal which JD(U) is opposed to.
At a time when BJP leaders are sending overtures to prospective allies like TMC, AIADMK and BJD, losing a long time ally may not be favoured by many within the ranks.
A section of the BJP top brass is also opposed to Modi becoming the PM candidate as they fear this will scare away some possible allies. They fancy their own chances in such a scenario.
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On its part, JD(U) has made clear that only a "secular" leader would be acceptable for the Prime Ministerial nominee. It has also emphasised that the PM candidate should be declared before the general elections.
While Singh has said he considers Modi a secular leader, he has remained non-committal on who will be the BJP's Prime Ministerial candidate.
Kumar, who is in the national capital for JD(U)'s national executive conclave, may hold a meeting with Singh later in the day.