It won't be easy for you. Yes, lots and lots of IMGs come to the US for residency. But in general, many have PhDs, and those that don't are typically the cream of the crop, even in not-particularly competitive specialties like pathology. And it is only getting harder now with an increase in medical school positions in the US and a lack of funding for residency positions.
That said, I'd advise against getting a PhD for the sole purpose of getting into a US residency. I can't imagine a bigger waste of time. I guess the point is you probably should have a very good reason for wanting to come to the US as our medical system is being overhauled and no one in the profession is particularly optimistic about the future. That and the PhD will be essentially useless for you if you do not intend on doing research- even worse, it won't help you at all past a select group of residencies and will be long and painful for you.