Seven Democratic senators are asking a bipartisan group of colleagues to reconsider plans to eliminate some categories of family visas as the group finalizes a comprehensive overhaul of immigration laws.

In a letter to the eight-member group, Democratic Sens. Mazie Hirono (Hawaii), Elizabeth Warren (Mass.), Barbara Boxer (Calif.), Sherrod Brown (Ohio), Brian Schatz (Hawaii), Tom Harkin (Iowa) and Al Franken (Minn.) praised the bipartisan effort but cautioned that the senators should maintain visas reserved specifically for foreign brothers, sisters and married children of U.S. citizens.