California olive oil producer Pat Ricchiuti feels the squeeze of foreign competition. So do his counterparts in Texas, Georgia and a handful of other states.

Now, with the help of congressional allies, these leading U.S. olive oil producers are forcing a closer look at a tough global market. In a U.S. International Trade Commission hearing this week, officials ratcheted up a yearlong investigation that could end up pitting importers against domestic producers and one country against another.

Read more