some even claiming asylum at the u.s./mexico border. we re just trying to decide where our new home will be. reporter: for children, the war possibly even more unsettling as places like this polish theater become a temporary home. in a rome hospital today, one visitor, pope francis, doing his best to spread hope to the war s smallest victims, sick ukrainian children who themselves are now refugees. whit, unicef warning children fleeing the war are at heightened risk of being trafficked and exploited, saying 500 unaccompanied children have been identified crossing into romania. the number of unaccompaniied children crossing, likely much higher than that. as we heard, a few hewn alexandria ocasio-cort hundred ukrainian refugees have come to the u.s. u.s. officials are looking at ways to bring more who want to come. abc s white house correspondent mary alice parks joins us now.