I don't have the statistics in front of me, but the match rates for US-born IMGs are still quite favorable and almost all find spots. It is a pretty significant red flag that this individual couldn't find a residency - unable to pass USMLEs? Very poor interviewing skills? Other major red flags (i.e. arrests)?
But there's a larger issue here. I'm on the residency app committee for my program - a few years ago, we along with several other large university-based programs, had a rule imposed on us from the GME that we had to apply for and get permission from the GME office prior to inviting IMGs to interview. We have had some incredible residents and attendings over the year from Caribbean and European medical schools, so it was not super well-received in our department. The pressure is largely political since MD and DO schools are expanding classes and entirely new schools are opening up so more domestic applicants are theoretically in the pipeline. I am not sure, but I believe this rule is still in effect.
