President Bush should order a 90-day cooling-off period in the U.S.-European "hormone meat" dispute, five consumer groups said Monday, arguing Europe's desire for consumer safety should be respected. The major component of the cooling off period would be U.S. suspension of 100 percent tariffs against seven European goods. The tariffs, which affect $100 million in trade, are retaliation for the European Community's ban on meat - foreign or domestic - produced with growth-stimulating hormones. "I think that would be a fair step to take," said Rod Leonard, director of the Community Nutrition Institute, who said Europe would be allowed to keep its ban in place. U.S. officials and livestock industry leaders argue the hormones used on U.S. livestock are safe and there is no scientific basis for the ban. They see the European action as a trade barrier in disguise.