>> we come to small boats, so -- so difficult it means, hundreds about 99.5 is dead. [ chanting ] >> reporter: thousands hoping to make it to austria, germany, france or the uk, on foot, trainings, and buses. but growing worry about the unintended consequences of opening borders to those fleeing war and isis. the risk to u.s. and european security and the stability of crucial allies in the middle east. >> lebanon and close allies like jordan are creaking under the strain of literally millions of refugees. >> reporter: the u.s. is under