It is learnt that Yadav declined to commit his support to Ansari's candidature telling the Prime Minister that a decision will be taken after discussion on the issue within the party as well as in NDA.
Breaking ranks with BJP, JD-U and Shiv Sena have supported UPA's Presidential poll nominee Pranab Mukherjee even as BJP and Akali Dal backed the Opposition nominee P A Sangma.
There is a view in Congress as well as in a section in JD-U that after hailing Ansari as a "good" name for Presidential nominee, it will be difficult for the party to explain the logic behind not supporting his candidature.
Yadav, however, remained non-committal on the issue of whether his party will support Ansari or not.
"We will discuss it in our party and then if it is required, NDA will meet. Only then a decision will be taken," he said.
There are indications that the party may take a few more days to take a final decision on the issue.