GRAND CANYON NATIONAL PARK, Ariz. (AP) — Arizona's congressional delegation says the National Park Service must do more to protect Grand Canyon employees who participate on the agency's river rafting trips. A report released last month by a federal watchdog found that Park Service workers have preyed on their female colleagues, demanding sex and retaliating against women who refused. The Park Service conducts about a dozen rafting trips on the Colorado River through the Grand Canyon each year. The agency banned alcohol on the trips and required pre-trip briefings while the Interior Department's Office of the Inspector General looked into allegations of sexual harassment. Arizona's congressional delegation says those reforms are insufficient.