Modi-Trump bonhomie has eroded Democratic support among diaspora, says US think tank.
Invites criticism for invoking Indian Prime Minister Narendra Modiâ€™s support.
The president says India is not doing enough in war-torn Afghanistan.
The president sarcastically callsÂ the Indian primeÂ ministerÂ â€˜fantasticâ€™
Ahead of the first Trump-Modi summit, relations are on uncertain footing.