If OP is a girl, reporting to HR is the best option.

As a guy, he needs to phrase it properly - like use political pressure and words like that to have an effect.

Understand the situation here, oh but first pleasea also understand that sexual harassment is a MUCH bigger deal. Something as trivial as a few political statements is not the same, it's comparing apples to fucking nuclear weapons.

Secondly. Please analyse the facts of the situation and consider expected outcomes. OP visits this office six weeks a year. OP is in India rest of the year. The annoying ABCDs/NRIs? They live in the same place as the HR guys and the upper management who make the real decisions that matter, e.g. if OP will continue to have a job or remain on the project (I'd kill for a job that gave me six weeks in Tokyo every year). They live in the same places, their kids go to the same schools, they attend barbecues and parties and things. In short the relationship between said ABCDs and client is much deeper than between client and OP.

So OP complains to HR. HR looks into it, and best-case outcome of this issue will be that the desis get a reprimand for talking about politics at work. OP gets justice boner. Now a reprimand for this sort of thing is no big deal in most corporates, but it's still not fun to have HR talk at you in a meeting, it is extremely not fun regardless of the actual severity of the matter. It's sort of a baseline extremely not fun state that starts with being pulled up for say dressing inappropriately escalating to flagrant sexual harassment or fraud. Political arguments or discussions would be perhaps a few notches from the bottom. So you understand that it's not a fun experience and if anyone did it to me over something as trivial as a political difference I'd be inclined against that person to say the least.

Fast forward two weeks. OP has boarded plane (Emirates if he's lucky, AI if not) and come back to Bharat Mata. Desi(s) (assuming at least a few of them are conniving enough and hold enough of a grudge) get together back in USA, thinking "Ab dekhenge bhonsdiwale". They start by casually mentioning how horrible Narendra Modi is and what sort of atrocities he's done. They'll be talking at lunch or something and someone will bring up how Modi was responsible for the death of thousands of Muslims and someone will be like hey have you seen this video, look how brutally Muslims were killed in Gujarat. Look how he appointed this man who by the way advocates digging up dead Muslims and raping them as the Chief Minister. And it's more than likely Client's HR and management are typical Americans with a vague idea of India. Before long OP will be seen as something equivalent to a supporter of literally Hitler, a man who daily orders the deaths of hundreds of Muslims and is making India a mass surveillance state. If they skim randia only they will get fifteen million things with video backup.

So then what happens. At the first possible opportunity Desis will push the client to get rid of OP for whatever flimsy reasons they can dream up (this is not particularly difficult to do). Indian consultancies are ass-lickers to a fault and will most likely acquiesce.

End result: OP is at the very least kicked off this project for spurious reasons, if he's somewhat unlucky ends up with just an average performance review. With really bad luck and particularly vindinctive desis he gets a bad performance review and put on the bench or something.

okay, enjoy the lung cancer in Delhi and pleasant smell of the lakes in bangalore.

And your dick grows by 3 inches. Also, Your Attractiveness rises by 4 points.

If s/he has American or any other citizenship, they aren't Indian anymore. Just because they are of Indian origin means nothing. They willfully returned the Indian citizenship, so they should be on their way and shouldn't be linked to us.

This is not a hatred for India, just the realization of India's problems that have become more acute outside of India.

People with weak roots take a very exaggerated form of identity as a form of compensation. You see this in the US with all the freakout at Halloween, with the costumes and cries of "cultural appropriation" etc. Some black people even think dreadlocks is a "black thing" (except that Celts and other European tribes have been using it for millenia, way before any meaningful contact with Africans).

The same dynamic holds for these people. It's what happens when you don't really feel like part of the mainstream yet your ancestral roots are weak, so you become stuck in a netherworld which can be deeply uncomfortable for some people.

You see the same dynamic with some mixed-race people, many of them have significant identity issues and above-average suicide rates etc.