California's multi-billion dollar citrus industry is asking the Trump administration to ensure that Canadian and Mexican markets remain open to oranges, lemons and grapefruit from the San Joaquin Valley. Joel Nelson, president of Exeter-based California Citrus Mutual says he hopes negotiators "do no harm" as they re-open talks on the North American Free Trade Agreement. Speaking on KVPR's Valley Edition, Nelson also said that other export markets remain a concern.