India should not support any nation for their Nuclear Arsenal dream including Iran. I don't think India has done it before. I hope India will not do in future too. However US can't dictate terms to India regarding diplomatic relationship with any country. When US can have with Pakistan despite their role in transfer of nuclear technology to Libya and North Korea, what legitamcy do US has to say about India.
Incidentally, Iran came to our rescue when Pakistan wanted to table Kashmir in UN during PV narasimha Rao's period. It forced Pakistan not to table the motion. US has not said a single word in support of India regarding Kashmir being an integral part of India.
Ask US to come out of their Hypocricy before dictating terms to India though India has prerogative to consider or not.