skylab. cb >> begnaud: on the defensive, the trump administration is doubling down on its threat to close the entire border with mexico to stop illegal immigration. why it could cost the u.s. economy millions. also tonight, joe biden sphonds. the former vice president insists he has never inappropriately touched anyone. gayle king has sat down with the two women accusing virginia's lieutenant goofer in of sexual assault. >> in my ideal world, i would want him to resign. >> begnaud: she got into the wrong car thinking it was her uber. now a suspect is under arrest in south carolina accused of killing this college student. and kids of courage, p their