Bringing San Diego to the forefront of the immigration debate, House Republicans will hold field hearings on the issue Wednesday at an Imperial Beach border patrol station. Two opposing immigration bills from the House and Senate will head for negotiations after the hearings senators and representatives are holding across the country this summer. San Diego area representatives have been heavily involved in the debate, some authoring sections of the House bill. Measures proposed in the House bill, H.R. 4437, include: making illegal presence in the country a felony, building 698 miles of fencing along the border, requiring employers to use...