there are extremist cells, of course, and preachers who preach hate. these should be dealt with by counter-terrorism forces. there is a system of religious education, madrasas and so forth, in saudi arabia or pakistan, that preach fundamentalist and hateful ideologies. there is no place for that in a western democracy.
but what the hell is 'home country influence' and why is that so undesirable? i take it if he moved abroad for a few years to work in policy or finance that he'd cut all ties with his home country, its educational systems, its institutions, etc.